Microsoft will retire Outlook Lite, its lightweight email client for Android, on May 25, 2026. Support for the app will cease, and new downloads were halted on October 6, 2025. Users can continue using the app until retirement, but after that date, mailbox access will be disabled. All emails, calendar items, and attachments will remain accessible through the main Outlook mobile app. Microsoft has added an Upgrade button in Outlook Lite to direct users to download the full Outlook mobile app.