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Office 365 User Cannot See On-Premises Free/Busy in Exchange 2010 Hybrid

By December 30, 2014August 5th, 2022Blog, Lync 2013, Lync Server 2013, Microsoft

I encountered an issue recently where, in an Exchange 2010 / Office 365 Hybrid environment, Office 365 users were unable to see calendar and Free/Busy information from On-Premises mailboxes.

I ran through a variety of diagnostic steps, including the “Hybrid Environment Free/busy Troubleshooter” and the Free/Busy test on the Office 365 of the Remote Connectivity Analyzer

Neither tool registered an error or indicated a configuration problem.

Eventually, I took a look at the state of the Federation Trust using Test-FederationTrust from the On-Premises Exchange server which returned:

A couple minutes later, calendar and Free/busy sharing were working as expected.

<hat tip>

Shane Skriletz , PEI

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