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Office365 & Exchange 2010 SP3 Hybrid Free/Busy

Posted on 2013-10-31
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Last Modified: 2013-11-08
We have a Hybrid environment set up for Office365 (Exchange 2003 cloud) & Exchange 2010 SP3 (On-Premise).

Free/Busy info isn't working across the environments, and I'm convinced it's because our On-Premise Exchange doesn't have Outlook Anywhere enabled, basically due to Security saying all external email access must to tunnel thru the corporate VPN.

So with that being said, I know that probably 'should' go back and enable Outlook Anywhere on all my Exchange servers, but that would cost tens of thousands of dollars just in new SSL certificates alone, all SAN Certs, where were trying to decommission the on-premise servers sooner rather than later, so spending more on them isn't preferred.

I heard there may be a way to get this done by creating a new Hub Transport configuration and Email Address Policy to allow communication between the two environments?
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Question by:GCTTechs
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Vasil Michev (MVP) earned 500 total points
ID: 39614372
You need autodiscover and EWS for free/busy, and the corresponding certificate should already be in place if you have hybrid. Better use the guided troubleshooter in this article to diagnose the problem:

http://support.microsoft.com/kb/2555008

Also do a Free/busy test on https://testconnectivity.microsoft.com/

Creating additional organizational relationships will not help with that, you already have one with Office 365. You should check its settings regardles, as the above article explains.
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