Category: Free/Busy
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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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Calendar Sharing In Exchange Online After Multi-Tenant Organizations (MTO) Is In Place
When you configure a Multi-Tenant Organization (MTO) relationship in Microsoft 365 one of the configurations that it can put in place for you is an Exchange Organization Relationship. This relationship allows you to view the Free/Busy status of mailboxes in the other organization(s) in the MTO. But this is not sharing your calendar, though it…
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Exchange Server and Missing Root Certificates
I came across an issue with a clients Exchange Server deployment today that is not well documented – or rather it is, but you need to know where to look. So I thought I would document the troubleshooting steps and the fix here. We specifically came across this error when testing Free/Busy for an Office…
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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…