How To Extend The EWS Shutdown Deadline From October 2026 To April 2027

01 // WHY OCTOBER 1 MATTERS

The Real Deadline Isn't The Final One

As Legality Software lays out in detail, Microsoft's complete EWS retirement is scheduled for April 2027 — but organizations that do nothing risk losing EWS connectivity starting October 1, 2026, well before that final cutoff. Any third-party software that still synchronizes with Outlook or Microsoft 365 through EWS is affected. Outlook's own built-in sync is not.

Waiting until vendor software stops syncing isn't a plan. The good news, per the article, is that Microsoft lets organizations extend access past October by completing a specific Exchange Online configuration before the deadline hits.

02 // WHAT EXTENDING THE DEADLINE INVOLVES

Three Things To Do Before October 1

Explicitly enable EWS for the tenant, rather than leaving it on Microsoft's default (soon-to-be-disabled) setting.
Configure Microsoft's EWS application allow list so approved applications keep their access.
Identify every application in the organization that still relies on EWS, so nothing gets left off the allow list.

Legality Software's article goes further with a free step-by-step guide covering the exact Exchange Online configuration, PowerShell commands, and validation steps — worth a read if you're the one doing the configuration. Read the full article and guide here.

03 // WHERE WE FIT IN

Extending The Deadline Buys You Time, Not A Fix

Completing Microsoft's configuration keeps EWS alive until the final April 2027 cutoff, but it doesn't change the fact that EWS is going away for good. Exchange Sync Bridge is what you switch to when that time comes: it speaks EWS to your existing software and translates to Microsoft Graph behind the scenes, so nothing about the software you already depend on has to change.

Not sure if your software is affected?

We can help you figure out what's using EWS and what your options are before either deadline hits.

Find Out If You're Impacted