Microsoft Outlook
Developer(s)Microsoft Corporation
Initial releaseJanuary 16, 1997
Stable release(s)
Microsoft 365 (Windows)2312 (Build 17126.20132)[1] / January 9, 2024 (2024-01-09)
Microsoft 365 (Mac)16.80 (Build 23121017) / December 12, 2023 (2023-12-12)[2]
One-time purchase (Retail)2021 Version 2311 (Build 17029.20108)[3] / December 12, 2023 (2023-12-12)[4]
One-time purchase (LTSC)2021 Version 2108 (Build 14332.20615) / December 12, 2023 (2023-12-12)[3]
Operating systemWindows, macOS
TypePersonal information manager
LicenseTrialware
Websitehttps://www.microsoft.com/microsoft-365/outlook/

Microsoft Outlook is a personal information manager software system from Microsoft, available as a part of the Microsoft 365 software suites. Though primarily being popular as an email client for businesses, Outlook also includes functions such as calendaring, task managing, contact managing, note-taking, journal logging, web browsing, and RSS news aggregation.

Individuals can use Outlook as a stand-alone application; organizations can deploy it as multi-user software (through Microsoft Exchange Server or SharePoint) for shared functions such as mailboxes, calendars, folders, data aggregation (i.e., SharePoint lists), and as appointment scheduling apps.

Other than the paid software on Windows and Mac desktops that this article talks about, the Outlook name also covers several other current software:

  • Outlook on the web, formerly Outlook Web App, a web version of Microsoft Outlook, included in Microsoft 365, Exchange Server, and Exchange Online (domain outlook.office365.com)
  • Outlook for Windows, a new, free Outlook application that will be preloaded with Windows 11 from 2024
  • Outlook Mobile, a mobile app version of Outlook
  • Outlook.com, formerly Hotmail, a free personal email service offered by Microsoft alongside a webmail client (domain outlook.live.com)

Versions

Outlook has replaced Microsoft's previous scheduling and email clients, Schedule+ and Exchange Client.

Outlook 98 and Outlook 2000 offer two configurations:

  • Internet Mail Only (aka IMO mode): A lighter application mode with specific emphasis on POP3 and IMAP accounts, including a lightweight Fax application.
  • Corporate Work group (aka CW mode): A full MAPI client with specific emphasis on Microsoft Exchange accounts.

Perpetual versions of Microsoft Outlook include:

NameVersion number[lower-roman 1]Release date[5]Notes
Outlook 97 8.0 January 16, 1997 Included in Office 97 and bundled with Exchange Server 5.0 and 5.5
Outlook 98 8.5 June 21, 1998 Freely distributed with books and magazines for coping with the newest Internet standard such as HTML email.[6] Outlook 98 setup was based on Active Setup which also installed Internet Explorer 4.[7]
Outlook 2000 9.0 June 27, 1999 Included in Office 2000 and bundled with Exchange 2000 Server.
Outlook 2002 10 May 31, 2001 Included in Office XP
Outlook 2003 11 November 20, 2003 Included in Office 2003 (incl. Standard Edition for Students and Teachers) and bundled with Exchange Server 2003
Outlook 2007 12 January 27, 2007 Included in Office 2007, except Office Home and Student edition
Outlook 2010 14 July 15, 2010 Included in Office 2010 Home and Business, Standard, Professional and Professional Plus
Outlook 2011 for Mac 14 October 26, 2010 Included in Office for Mac 2011 Home and Business
Outlook 2013 15 January 29, 2013 Included in Office 2013, except Home & Student edition
Outlook for Mac 15.3 October 31, 2014 Included in Office 365, except some commercial editions
Outlook 2016 16 September 22, 2015 Included in Office 2016 and Office 365
Outlook 2016 for Mac 15.12 September 25, 2015 Included in Office 2016 and Office 365
Outlook 2019 16 September 24, 2018 Included in Office 2019 and Office 365
Outlook 2019 for Mac 16.17 September 24, 2018 Included in Office 2019 and Office 365
Outlook for Phones & Tablets 1.3 2015 Included in Office 365, except some commercial editions

Includes iOS and Android support

Microsoft Outlook

[6]

Microsoft Outlook is a part of Office Suite that can be used as a standalone application. It helps you to access Microsoft Exchange Server email. Additionally, it provides contacts, calendaring, and task management functionality. This advanced email application is widely used for business purposes. Many organizations integrate Outlook with the Microsoft Sharepoint platform for sharing crucial file data. Also, It stores a local copy of the information on your system, when you configure an email account with Outlook.

Newer versions do not allow using browsers from other vendors to open links.[8]

Privacy is severely degraded in latest versions, as new Outlook sends passwords, mails and other data to Microsoft.[9][10]

Outlook 2002

Outlook 2002 introduced these new features:[11]

  • Autocomplete for email addresses
  • Colored categories for calendar items
  • Group schedules
  • Hyperlink support in email subject lines
  • Native support for Outlook.com (formerly Hotmail)
  • Improved search functionality, including the ability to stop a search and resume it later
  • Lunar calendar support
  • MSN Messenger integration
  • Performance improvements[12]
  • Preview pane improvements, including the ability to:
    • open hyperlinks;
    • respond to meeting requests; and
    • display email properties without opening a message
  • Reminder window that consolidates all reminders for appointments and tasks in a single view
  • Retention policies for documents and email
  • Security improvements, including the automatic blocking of potentially unsafe attachments and of programmatic access to information in Outlook:
  • Smart tags when Word is configured as the default email editor. This option was available only when the versions of Outlook and Word were the same, i.e. both were 2002.

Outlook 2003

Outlook 2003 introduced these new features:[16]

Outlook 2007

The main Outlook 2007 interface with its menus and toolbars
Outlook 2007 with options for text message composition. The left-hand side depicts a preview of how the message will appear on the recipient's phone.

Features that debuted in Outlook 2007 include:[20]

  • Attachment preview, with which the contents of attachments can be previewed before opening
  • Auto Account Setup, which allows users to enter a username and password for an email account without entering a server name, port number, or other information
  • Calendar sharing improvements including the ability to export a calendar as an HTML file—for viewing by users without Outlook—and the ability to publish calendars to an external service (e.g., Office Web Apps) with an online provider (e.g., Microsoft account)
  • Colored categories with support for user roaming, which replace colored (quick) flags introduced in Outlook 2003[22]
  • Improved email spam filtering and anti-phishing features
    • Postmark intends to reduce spam by making it difficult and time-consuming to send it
  • Information rights management improvements with Windows Rights Management Services and managed policy compliance integration with Exchange Server 2007
  • Japanese Yomi name support for contacts
  • Multiple calendars can be overlaid with one another to assess details such as potential scheduling conflicts
  • Ribbon (Office Fluent) interface
  • Outlook Mobile Service support, which allowed multimedia and SMS text messages to be sent directly to mobile phones[23]
  • Instant search through Windows Search, an index-based desktop search platform
    • Instant search functionality is also available in Outlook 2002 and Outlook 2003 if these versions are installed alongside Windows Search[24]
  • Integrated RSS aggregation
  • Support for Windows SideShow with the introduction of a calendar gadget[25]
  • To-Do Bar that consolidates calendar information, flagged email, and tasks from OneNote 2007, Outlook 2007, Project 2007, and Windows SharePoint Services 3.0 websites within a central location.
  • The ability to export items as PDF or XPS files
  • Unified messaging support with Exchange Server 2007, including features such as missed-call notifications, and voicemail with voicemail preview and Windows Media Player[25]
  • Word 2007 replaces Internet Explorer as the default viewer for HTML email,[22] and becomes the default email editor in this and all subsequent versions.

Outlook 2010

Features that debuted in Outlook 2010 include:[26]

  • Additional command-line switches
  • An improved conversation view that groups messages based on different criteria regardless of originating folders
  • IMAP messages are sent to the Deleted Items folder, eliminating the need to mark messages for future deletion
  • Notification when an email is about to be sent without a subject
  • Quick Steps, individual collections of commands that allow users to perform multiple actions simultaneously
  • Ribbon interface in all views
  • Search Tools contextual tab on the ribbon that appears when performing searches and that includes basic or advanced criteria filters
  • Social Connector to connect to various social networks and aggregate appointments, contacts, communication history, and file attachments
  • Spell check-in additional areas of the user interface
  • Support for multiple Exchange accounts in a single Outlook profile
  • The ability to schedule a meeting with a contact by replying to an email message
  • To-Do Bar enhancements including visual indicators for conflicts and unanswered meeting requests
  • Voicemail transcripts for Unified Messaging communications
  • Zooming user interface for calendar and mail views

Outlook 2013

Features that debuted in Outlook 2013, which was released on January 29, 2013, include:

Outlook 2016

Features that debuted in Outlook 2016, include:[27]

Outlook 2019

Features that debuted in Outlook 2019, include:[28]

  • Focused Inbox
  • Add multiple time zones
  • Listen to your emails
  • Easier email sorting
  • Automatic download of cloud attachments
  • True Dark Mode (version 1907 onward)

Macintosh

Outlook for Mac with the new UI applied

Microsoft also released several versions of Outlook for classic Mac OS, though it was only for use with Exchange servers. It was not provided as a component of Microsoft Office for Mac but instead made available to users from administrators or by download. The final version was Outlook for Mac 2001, which was fairly similar to Outlook 2000 and 2002 apart from being exclusively for Exchange users.

Microsoft Entourage was introduced as an Outlook-like application for Mac OS in Office 2001, but it lacked Exchange connectivity. Partial support for Exchange server became available natively in Mac OS X with Entourage 2004 Service Pack 2. Entourage is not directly equivalent to Outlook in terms of design or operation; rather, it is a distinct application that has several overlapping features including Exchange client capabilities. Somewhat improved Exchange support was added in Entourage 2008 Web Services Edition.

Microsoft Outlook for Mac 2011

Entourage was replaced by Outlook for Mac 2011, which features greater compatibility and parity with Outlook for Windows than Entourage offered. It is the first native version of Outlook for MacOS.

Outlook 2011 initially supported Mac OS X's Sync Services only for contacts, not events, tasks or notes. It also does not have a Project Manager equivalent to that in Entourage.[29] With Service Pack 1 (v 14.1.0), published on April 12, 2011, Outlook can now sync calendar, notes and tasks with Exchange 2007 and Exchange 2010.

On October 31, 2014, Microsoft released Outlook for Mac (v15.3 build 141024) with Office 365 (a software as a service licensing program that makes Office programs available as soon as they are developed). Outlook for Mac 15.3 improves upon its predecessors with:[30]

  • Better performance and reliability as a result of a new threading model and database improvements.
  • A new modern user interface with improved scrolling and agility when switching between Ribbon tabs.
  • Online archive support for searching Exchange (online or on-premises) archived mail.
  • Master Category List support and enhancements delivering access to category lists (name and color) and sync between Mac, Microsoft Windows and OWA clients.
  • Office 365 push email support for real-time email delivery.
  • Faster first-run and email download experience with improved Exchange Web Services syncing.[30]

The "New Outlook for Mac" client, included with version 16.42 and above, became available for "Early Insider" testers in the fall of 2019, with a public "Insider" debut in October 2020.[31][32] It requires macOS 10.14 or greater and introduces a redesigned interface with significantly changed internals, including native search within the client that no longer depends on macOS Spotlight.[33] Some Outlook features are still missing from the New Outlook client as it continues in development.[34]

To date, the Macintosh client has never had the capability of syncing Contact Groups/Personal Distribution Lists from Exchange, Microsoft 365 or Outlook.com accounts, something that the Windows and web clients have always supported.[35] A UserVoice post created in December 2019 suggesting that the missing functionality be added has shown a "Planned" tag since October 2020.[36]

In March 2023, Microsoft announced that Outlook for Mac will be available for free. This means that users will no longer need a Microsoft 365 subscription or an Office licence to use the program.[37]

Phones and tablets

First released in April 2014 by the venture capital-backed startup Acompli, the company was acquired by Microsoft in December 2014. On January 29, 2015, Acompli was re-branded as Outlook Mobile—sharing its name with the Microsoft Outlook desktop personal information manager and Outlook.com email service.[38] In January 2015, Microsoft released Outlook for phones and for tablets (v1.3 build) with Office 365.[39] This was the first Outlook for these platforms with email, calendar, and contacts.

On February 4, 2015, Microsoft acquired Sunrise Calendar;[40] on September 13, 2016, Sunrise ceased to operate, and an update was released to Outlook Mobile that contained enhancements to its calendar functions.[41][42]

Similar to its desktop counterpart, Outlook mobile offers an aggregation of attachments and files stored on cloud storage platforms; a "focused inbox" highlights messages from frequent contacts, and calendar events, files, and locations can be embedded in messages without switching apps. The app supports a number of email platforms and services, including Outlook.com, Microsoft Exchange and Google Workspace (formerly G Suite) among others.

Outlook mobile is designed to consolidate functionality that would normally be found in separate apps on mobile devices, similar to personal information managers on personal computers. It is designed around four "hubs" for different tasks, including "Mail", "Calendar," "Files" and "People". The "People" hub lists frequently and recently used contacts and aggregates recent communications with them, and the "Files" hub aggregates recent attachments from messages, and can also integrate with other online storage services such as Dropbox, Google Drive, and OneDrive.[43][44][45][46][47] To facilitate indexing of content for search and other features, emails and other information are stored on external servers.[48]

Outlook mobile supports a large number of different e-mail services and platforms, including Exchange, iCloud, GMail, Google Workspace (formerly G Suite), Outlook.com, and Yahoo! Mail.[49][50] The app supports multiple email accounts at once.[51]

Emails are divided into two inboxes: the "Focused" inbox displays messages of high importance, and those from frequent contacts. All other messages are displayed within an "Other" section.[48][52] Files, locations, and calendar events can be embedded into email messages. Swiping gestures can be used for deleting messages.[45][53][54][55]

Like the desktop Outlook, Outlook mobile allows users to see appointment details, respond to Exchange meeting invites, and schedule meetings. It also incorporates the three-day view and "Interesting Calendars" features from Sunrise.[56]

Files in the Files tab are not stored offline; they require Internet access to view.

Security

Outlook mobile temporarily stores and indexes user data (including email, attachments, calendar information, and contacts), along with login credentials,[57] in a "secure" form on Microsoft Azure servers located in the United States.[58] On Exchange accounts, these servers identify as a single Exchange ActiveSync user in order to fetch e-mail. Additionally, the app does not support mobile device management, nor allows administrators to control how third-party cloud storage services are used with the app to interact with their users. Concerns surrounding these security issues have prompted some firms, including the European Parliament, to block the app on their Exchange servers.[59][60][61] Microsoft maintains a separate, pre-existing Outlook Web Access app for Android and iOS.[61]

Outlook Groups

Outlook Groups was a mobile application for Windows Phone, Windows 10 Mobile, Android and iOS that could be used with an Office 365 domain Microsoft Account, e.g. a work or school account. It is designed to take existing email threads and turn them into a group-style conversation. The app lets users create groups, mention their contacts, share Office documents via OneDrive and work on them together, and participate in an email conversation. The app also allows the finding and joining of other Outlook Groups. It was tested internally at Microsoft and launched September 18, 2015, for Windows Phone 8.1 and Windows 10 Mobile users.[62]

After its initial launch on Microsoft's own platforms they launched the application for Android and iOS on September 23, 2015.[63]

Outlook Groups was updated on September 30, 2015, that introduced a deep linking feature as well as fixing a bug that blocked the "send" button from working.[64] In March 2016 Microsoft added the ability to attach multiple images, and the most recently used document to group messages as well as the option to delete conversations within the application programme.[65]

Outlook Groups was retired by Microsoft on May 1, 2018.[66] The functionality was replaced by adding the "Groups node" to the folder list within the Outlook mobile app.[67]

Internet standards compliance

HTML rendering

Outlook 2007 was the first Outlook to switch from Internet Explorer rendering engine to Microsoft Word 2007's. This meant that HTML and Cascading Style Sheets (CSS) items not handled by Word were no longer supported. On the other hand, HTML messages composed in Word look as they appeared to the author.[68] This affects publishing newsletters and reports, because they frequently use intricate HTML and CSS to form their layout. For example, forms can no longer be embedded in an Outlook email.

Support of CSS properties and HTML attributes

Outlook for Windows has very limited CSS support compared to various other e-mail clients. Neither CSS1 (1996) nor CSS2 (1998) specifications are fully implemented and many CSS properties can only to be used with certain HTML elements for the desired effect.[69] Some HTML attributes help achieve proper rendering of e-mails in Outlook, but most of these attributes are already deprecated in the HTML 4.0 specifications (1997).[70] In order to achieve the best compatibility with Outlook, most HTML e-mails are created using multiple boxed tables, as the table element and its sub-elements support the width and height property in Outlook. No improvements have been made towards a more standards-compliant email client since the release of Outlook 2007.[71]

Transport Neutral Encapsulation Format

Outlook and Exchange Server internally handle messages, appointments, and items as objects in a data model which is derived from the old proprietary Microsoft Mail system, the Rich Text Format from Microsoft Word and the complex OLE general data model.[72] When these programs interface with other protocols such as the various Internet and X.400 protocols, they try to map this internal model onto those protocols in a way that can be reversed if the ultimate recipient is also running Outlook or Exchange.[73]

This focus on the possibility that emails and other items will ultimately be converted back to Microsoft Mail format is so extreme that if Outlook/Exchange cannot figure out a way to encode the complete data in the standard format, it simply encodes the entire message/item in a proprietary binary format called Transport Neutral Encapsulation Format (TNEF) and sends this as an attached file (usually named "winmail.dat") to an otherwise incomplete rendering of the mail/item. If the recipient is Outlook/Exchange it can simply discard the incomplete outer message and use the encapsulated data directly, but if the recipient is any other program, the message received will be incomplete because the data in the TNEF attachment will be of little use without the Microsoft software for which it was created.[73] As a workaround, numerous tools for partially decoding TNEF files exist.

Calendar compatibility

Outlook does not fully support data and syncing specifications for calendaring and contacts, such as iCalendar, CalDAV, SyncML, and vCard 3.0. Outlook 2007 claims to be fully iCalendar compliant; however, it does not support all core objects, such as VTODO or VJOURNAL.[74] Also, Outlook supports vCard 2.1 and does not support multiple contacts in the vCard format as a single file. Outlook has also been criticized for having proprietary "Outlook extensions" to these Internet standards.

.msg format

Outlook (both the web version and recent non-web versions) promotes the usage of a proprietary .msg format[75] to save individual emails, instead of the standard .eml format. Messages use .msg by default when saved to disk or forwarded as attachments. Compatibility with past or future Outlook versions is not documented nor guaranteed;[76] the format saw over 10 versions released since version 1 in 2008.[75]

The standard .eml format replicates the format of emails as used for transmission and is therefore compatible with any email client which uses the normal protocols. Standard-compliant email clients, like Mozilla Thunderbird, use additional headers to store software-specific information related e.g. to the local storage of the email, while keeping the file plain-text, so that it can be read in any text editor and searched or indexed like any document by any other software.

Security concerns

As part of its Trustworthy Computing initiative, Microsoft took corrective steps to fix Outlook's reputation in Office Outlook 2003. Among the most publicized security features are that Office Outlook 2003 does not automatically load images in HTML emails or permit opening executable attachments by default, and includes a built-in Junk Mail filter.[77] Service Pack 2 has augmented these features and adds an anti-phishing filter.[78]

Outlook add-ins

Outlook add-ins are small additional programs for the Microsoft Outlook application, mainly purposed to add new functional capabilities into Outlook and automate various routine operations. The term also refers to programs where the main function is to work on Outlook files, such as synchronization or backup utilities. Outlook add-ins may be developed in Microsoft Visual Studio[79] or third-party tools such as Add-in Express. Outlook add-ins are not supported in Outlook Web App.

From Outlook 97 on, Exchange Client Extensions are supported in Outlook. Outlook 2000 and later support specific COM components called Outlook Add-Ins. The exact supported features (such as .NET components) for later generations were extended with each release.

SalesforceIQ Inbox for Outlook

In March 2016, Salesforce announced that its relationship intelligence platform, SalesforceIQ, would be able to seamlessly integrate with Outlook.[80] SalesforceIQ works from inside the Outlook inbox providing data from CRM, email, and customer social profiles. It also provides recommendations within the inbox on various aspects like appointment scheduling, contacts, responses, etc.

Hotmail Connector

Hotmail Connector setup screen

Microsoft Outlook Hotmail Connector (formerly Microsoft Office Outlook Connector), is a discontinued and defunct free add-in for Microsoft Outlook 2003, 2007 and 2010, intended to integrate Outlook.com (formerly Hotmail) into Microsoft Outlook. It uses DeltaSync, a proprietary Microsoft communications protocol that was formerly used by Hotmail.[81]

In version 12, access to tasks and notes and online synchronization with MSN Calendar is only available to MSN subscribers of paid premium accounts. Version 12.1, released in December 2008 as an optional upgrade, uses Windows Live Calendar instead of the former MSN Calendar. This meant that calendar features became free for all users, except for task synchronization which became unavailable. In April 2008, version 12.1 became a required upgrade to continue using the service as part of a migration from MSN Calendar to Windows Live Calendar.[82]

Microsoft Outlook 2013 and its newer versions have intrinsic support for accessing Outlook.com and its calendar over the Exchange ActiveSync (EAS) protocol,[83] while older versions of Microsoft Outlook can read and synchronize Outlook.com emails over the IMAP protocol.[84]

Social Connector

Outlook Social Connector was a free add-in for Microsoft Outlook 2003 and 2007 by Microsoft that allowed integration of social networks such as Facebook, LinkedIn and Windows Live Messenger into Microsoft Outlook.[85] It was first introduced on November 18, 2009.[86] Starting with Microsoft Office 2010, Outlook Social Connector is an integral part of Outlook.[87]

CardDAV and CalDAV Connector

Since Microsoft Outlook does not support CalDAV and CardDAV protocol along the way, various third-party software vendors developed Outlook add-ins to enable users synchronizing with CalDAV and CardDAV servers. CalConnect has a list[88] of software that enable users to synchronize their calendars with CalDAV servers/contacts with CardDAV servers.

Importing from other email clients

Traditionally, Outlook supported importing messages from Outlook Express and Lotus Notes. In addition, Microsoft Outlook supports POP3 and IMAP protocols, enabling users to import emails from servers that support these protocols. Microsoft Hotmail Connector add-in (described above) helps importing emails from Hotmail accounts. Outlook 2013 later integrated the functionality of this add-in and added the ability to import email (as well as a calendar) through Exchange ActiveSync protocol.[83]

There are some ways to get the emails from Thunderbird; the first is to use a tool[89] that can convert a Thunderbird folder to a format that can be imported from Outlook Express. This method must be processed folder by folder. The other method is to use a couple of free tools that keep the original folder structure.[90] If Exchange is available, an easier method is to connect the old mail client (Thunderbird) to Exchange using IMAP, and upload the original mail from the client to the Exchange account.[91]

New Outlook for Windows

In May 2022, Microsoft announced a preview release of new Outlook for Windows, available initially to Office Insiders. The new version of Outlook is a progressive web app based on Outlook.com and offers several new features.[92]

The new Outlook for Windows preview later became available to all existing Outlook for Windows users and also users of the free Mail and Calendar app, which is to be retired in favor of the new app.[93][94]

The new Outlook has been criticized for having worse performance compared to the previous native versions as well as lack of offline support.

See also

References

Notes

  1. ↑ The version numbers follows the Office numbers.

Citations

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  2. ↑ "Update history for Office for Mac". Microsoft Docs. December 29, 2023.
  3. 1 2 "Update history for Office LTSC 2021 and Office 2021". December 29, 2023.
  4. ↑ Warren, Tom. "Microsoft Office 2021 will launch on October 5th". The Verge. Retrieved October 5, 2021.
  5. ↑ "Microsoft Outlook Life-cycle Information". Retrieved October 23, 2011.
  6. 1 2 Singh, Rohit (June 3, 2021). "The Ultimate Guide to Convert Outlook OST to PST File". Cigati Solutions.
  7. ↑ "OL98: How to Troubleshoot Active Setup Problems in Windows 98, 98 SE or ME". Support (3.1 ed.). January 29, 2007. Archived from the original on March 16, 2007. Retrieved June 18, 2019.
  8. ↑ Microsoft is forcing Outlook and Teams to open links in Edge, and IT admins are angry
  9. ↑ Warning: New Outlook sends passwords, mails and other data to Microsoft
  10. ↑ Microsoft krallt sich Zugangsdaten: Achtung vor dem neuen Outlook
  11. ↑ "Microsoft Outlook 2002 Product Guide". Microsoft. May 30, 2001. Archived from the original (DOC) on February 7, 2003. Retrieved December 31, 2017.
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  13. ↑ "OL2002: Users Can Read Nonsecure E-mail as Plain Text". Support. Microsoft. Archived from the original on October 20, 2004. Retrieved December 31, 2017.
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