Microsoft to retire the OWA Light client in Exchange Server

Microsoft has announced the retirement of the OWA Light client in Exchange Server, citing modern browser capabilities, improved network conditions, and evolving security requirements as reasons. The lightweight web client, introduced two decades ago for older browsers and low-bandwidth environments, will be disabled in an upcoming update expected in August 2026. This move aims to reduce legacy attack surface and streamline engineering efforts toward the modern Outlook on the web experience.

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