Microsoft sends Outlook Lite to the great inbox in the sky as memory costs skyrocket

Having blocked new installations of Outlook Lite in October 2025, Microsoft will " complete the retirement" of the app on May 25.

After that date, users will still be able to open the app, but mailbox access will be disabled, and in-app navigation and functionality will no longer work. User accounts won't be deleted or disabled, but the company is very keen for users to switch to Microsoft Outlook Mobile.

Outlook Lite required a comparatively small amount of storage to run. According to Microsoft, the download size at launch was just 5 MB, and it was optimized to run acceptably on all Android devices, including hardware with 1 GB RAM. The company also bragged about the application's low battery usage and that it would work well on 2G and 3G networks.

That was in 2022. In 2026, when memory costs are skyrocketing, Microsoft decided it was time to pull the plug on something so efficient in favor of Microsoft Outlook Mobile, "our primary mobile email experience."

The company wants to reduce overlap, so Outlook Lite has been put out to pasture. Meanwhile, the Outlook Mobile codebase lumbers on.

Microsoft stated that "no admin action is required" other than telling any users still running Outlook Lite about the upcoming retirement. And perhaps considering replacing any devices that will struggle with Outlook Mobile.

It is unclear why Microsoft is abandoning devices with limited storage and memory. Given the company's size and its various internal fiefdoms, keeping the Outlook Lite lights on would have required little effort. After all, Microsoft is famously not averse to multiple Outlook versions.

In 2024, a year before the decision to retire the application, Outlook Lite accounted for more than 10 million downloads, doubling in less than a year. As such, while the application was hardly ubiquitous, it had a following.

However, times change, and Microsoft has clearly decided that keeping an app alive that targets older and low-end devices is not worth its while. ®