Microsoft plans to disable and remove OWA Light, the lightweight Outlook Web Access client for Exchange Server, in an upcoming update expected in August 2026. The company says retiring the two-decade-old legacy interface will reduce attack surface and engineering complexity, pushing users to the modern Outlook on the web experience instead. BleepingComputer reports: "OWA Light was an important compatibility experience when the web needed it. Today, the full Outlook on the web experience is the right place for us to focus," the Exchange Team said on Wednesday. "Retiring OWA Light will help reduce legacy surface area, simplify ongoing engineering work, and allow us to continue improving the experience customers use every day."

Microsoft introduced OWA Light roughly two decades ago as an alternative to OWA Premium, offering a simplified web interface for systems that didn't have Internet Explorer 6 or later installed or ran older web browsers. At the time, the company said that OWA Light offered a cleaner look, faster logon times on low-bandwidth Internet connections, and worked in locked-down browser modes (such as kiosks).

Microsoft deprecated OWA Light as of August 19, 2024, and announced this week that the OWA Light experience will likely be removed from Exchange Server (on-premises) next month. "In an upcoming Exchange Server update (estimated in August 2026), we plan to disable and remove the OWA Light experience. After that change is introduced, users will no longer be able to choose or be redirected to OWA Light and should use the modern Outlook on the web experience instead."