Microsoft plans to stop supporting Windows Mail, Calendar, and Contacts apps later this year. The software giant has been migrating existing users of these apps to the new Outlook for Windows app in recent months, and now it has set an end of support date for the Mail, Calendar and Contacts applications for December 31.

Once application support ends later this year, Microsoft warns that users who have not migrated to the new Outlook application “will no longer be able to send and receive email using Windows Mail and Calendar”.

Microsoft has been rolling out the new Outlook for Windows app for years, and it’s officially reaching general availability. in August. The new web version of Outlook is also designed to eventually replace the full desktop version of Outlook, and Microsoft plans to provide business customers with 12 months’ notice before it begins to phase out the desktop version of Outlook.

Existing installations of classic Outlook via perpetual and subscription licenses will continue to be supported until at least 2029, so it will take some time for Microsoft to completely migrate all Outlook users to this new application. It starts with the Mail and Calendar apps on Windows later this year, followed by an opt-out phase for Outlook on Windows. You can learn more about Microsoft’s schedule for new Outlook for Windows here.