Category: EWS
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Cross-Tenant Policies To Replace Free/Busy Organization Relationships
Exchange Web Services (EWS) is used to support cross-tenant free/busy lookups (between different M365/Entra ID tenants). EWS is being disabled in Exchange Online, and so any Organization Relationship that you have that allows Free/Busy cross-tenant needs to be updated to Cross-Tenant Access Policies (XTAP). Microsoft have the documentation for this at Migrate to Microsoft 365…
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Exchange Online Free/Busy Issues with OAuth Authentication
Update: 10 Dec 2014: It is reported that this issue is fixed in CU7 for Exchange Server 2013 OAuth authentication is a new server to server authentication model available in Exchange 2013 SP1 and later and Exchange Online (Office 365). With OAuth enabled and Exchange hybrid in place and where you have multiple endpoints of…
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Exchange Web Services (EWS) and 501 Error
As is common with a lot that I write in this blog, it is based on noting down the answers to stuff I could not find online. For this issue, I did find something online by Michael Van “Hybrid”, but finding it was the challenge. So rather than detailing the issue and the reason (you…