Legacy Outlook clients retirement plan

Microsoft has announced that from mid-July 2024, legacy versions of Outlook clients will be retired, making it necessary for users to update to the latest versions to continue receiving support. Outdated Outlook clients on iOS, Android, Mac, and Windows Mail and Calendar applications will be affected. Starting from mid-August, outdated browsers will also receive an error on Outlook web. Affected users must upgrade to the newest versions for continued functionality and support. For organizations with vanity domains, users with outdated versions of Outlook for iOS versions prior to 4.2411, Outlook for Android versions before 4.2342, Outlook for Mac versions older than 16.73, and Windows Mail and Calendar applications will experience diminishing functionality. The retirement is set to begin gradually and will be completed by late September 2024 for Outlook iOS, Android, Mac, and Windows Mail and Calendar Application and late October 2024 for Outlook on the web.

Organizations that rely on these outdated versions will no longer be supported, and users will no longer be able to send or receive new emails after the retirement. Users are encouraged to switch to the new Outlook for Windows and update to the newest versions of Outlook on iOS, Android, and Mac as Microsoft's development efforts and advanced security measures will focus on these updated platforms. Microsoft will no longer redirect to OWA, and the set-CASMailbox cmdlet for Exchange Online User will no longer support the IsOptimizedForAccessibility parameter. Outlook on the Web latest supports all accessibility features.

This change will affect users with outdated versions of Outlook clients on iOS, Android, Mac, and Windows Mail and Calendar applications, and they will need to upgrade to the newest versions for seamless functionality and support. The retirement of legacy Outlook clients is part of Microsoft's ongoing effort to provide advanced security measures and development efforts on updated platforms.

The post Legacy Outlook clients retirement plan appeared first on M365 Admin.