Microsoft to switch off Outlook Web Access Light next August
The stripped-down webmail client, aimed at old browsers and slow connections, will be removed from Exchange Server in an update expected around August 2026.
Key points
- Microsoft plans to disable and remove Outlook Web Access Light (OWA Light) from on-premises Exchange Server in an update expected in August 2026.
- OWA Light was already marked deprecated (meaning: officially on the way out) on August 19, 2024.
- Administrators can turn OWA Light off today using two PowerShell commands published by Microsoft.
- After the update ships, users who currently pick the Light option will be sent to the standard Outlook on the web instead.
Microsoft is retiring the slimmed-down version of its webmail client for corporate email servers.
The product is called Outlook Web Access Light, or OWA Light: the basic-looking browser email page that staff at companies running their own Microsoft Exchange Server see when they log in. Think of it as the no-frills alternative to the full webmail site.
Microsoft's Exchange Team confirmed the plan on Wednesday. The switch-off is expected in an Exchange Server update around August 2026. After it lands, the Light option disappears and everyone moves to the modern Outlook on the web.
Why is Microsoft killing it off?
Because almost nobody needs it anymore. Microsoft built OWA Light roughly two decades ago for people on old browsers like Internet Explorer 5, on slow dial-up connections, or on locked-down kiosk computers. It loaded faster and looked plainer, working where the full version wouldn't.
That world's largely gone. "Modern browsers are more capable and more consistent, network conditions have improved for many customers, and the security picture has shifted substantially," the Exchange Team wrote. Retiring the Light client, Microsoft says, cuts old code the company still has to maintain and secure. "OWA Light was an important compatibility experience when the web needed it," the team added. "Today, the full Outlook on the web experience is the right place for us to focus."
What does OWA Light actually do (and not do)?
Your inbox appears in a simple layout; you can read and send mail. That's roughly where the feature list ends.
OWA Light can't show your calendar in weekly or monthly view, open shared mailboxes or shared calendars, import or export messages and contacts, or create and edit tasks and notes. Anyone living in the Light client for years has been living without a good chunk of the standard office toolkit.
Who is affected?
Only organisations running Exchange Server on their own hardware need to act. Businesses using cloud-hosted Exchange aren't the target of this announcement.
The people who'll notice are staff at companies where IT routes some users, often on older machines, to the Light login. Those users will be sent to the full webmail page after the August 2026 update. The full page is heavier but supports every feature, including the calendar views and shared mailboxes that OWA Light never had.
What should IT admins do now?
Microsoft's giving administrators a head start. Two PowerShell commands (PowerShell is the scripting tool Windows admins use to run bulk changes) turn OWA Light off ahead of time.
Set-OwaMailboxPolicy -OwaLightEnabled $false blocks the Light client for users covered by that policy. Set-OwaVirtualDirectory -LogonPageLightSelectionEnabled $false removes the Light option from the login page.
Admins who run those commands now can test how staff cope with the modern client before Microsoft forces the change. That matters especially for anyone still on older PCs or unusual browsers that might struggle with the full Outlook on the web. We covered Exchange Server security in June when Microsoft's Patch Tuesday logged 210 CVEs and three zero-days, a reminder that legacy surface area in on-premises deployments carries real risk well before any planned retirement date.
Should end users worry?
No action needed. If the Light interface has been your daily email view, expect it to look different one morning: more buttons, a proper calendar, the same mail underneath. The retirement date gives IT teams time to prepare, but most users won't feel it until the update arrives.
