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Where to Migrate a Public Folder Calendar Before EWS Goes Away

ByKate

Shared team calendars living in Exchange Online (Microsoft 365 cloud) public folders are on borrowed time. Starting October 1st, 2026, Microsoft begins switching EWS off in Exchange Online, tenant by tenant, and on April 1st, 2027, it is fully and permanently disabled, with the tenant-level switch itself removed. Public folders are the sharpest edge of…

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How to keep EWS working in Exchange Online after October 2026

ByKate

Microsoft is retiring Exchange Web Services (EWS) in Exchange Online (Microsoft 365 cloud), and the first deadline is days away. If your organization relies on an app that syncs mail, calendars, tasks, or contacts over EWS, you can keep it running until the final shutdown with a short PowerShell change. Here’s what’s happening and how…