Microsoft to Retire Mail & Calendar App by December 31, 2024

December 31, 2024, marks the end date for the Mail & Calendar app. This beloved application has served users well over the years, but as the digital landscape evolves, so too must the tools we use. Microsoft has decided to retire the app in favor of introducing a more advanced user interface and enhanced features that were not feasible with the old UWP app.

A New Era with Outlook

While users can technically continue using Mail & Calendar even after its retirement date, Microsoft strongly advises against it. The app will be purged from the Microsoft Store, making it impossible to install or reinstall. This transition signifies a significant shift towards the new Outlook web app, which promises to offer a more robust and feature-rich experience.

For those who have grown accustomed to Mail & Calendar, the transition might seem daunting at first. However, Microsoft is committed to ensuring a smooth shift by gradually incorporating missing features into the new Outlook web app. In the coming months, users can expect the addition of COM add-ins and support for “.PST” files, among other enhancements.

Preparing for the Transition

To make this transition as seamless as possible, here are some steps users can take:

1. Backup Important Data: Ensure all your important emails and calendar events are backed up. This can be done by exporting your data to a “.PST” file.
2. Familiarize Yourself with Outlook: Start using the Outlook web app now to get comfortable with its interface and features.
3. Stay Updated: Keep an eye on Microsoft’s announcements for updates on new features and improvements.

The end of Mail & Calendar marks not just the end of an era but also the beginning of a new one. With Microsoft's commitment to innovation and user experience, the new Outlook web app is poised to offer a superior alternative that meets the evolving needs of its users.

Update: 23 Jun 2026