At last, the chocks have been released and the runway is almost clear for Exchange 2013 deployment. The missing places that have stopped existing customers introducing Exchange 2013 into their environment have been provided with the release of: Exchange 2010 SP3 Exchange 2007 SP3 RU10 Basically, these are the versions of Exchange that understand how to play together nicely with Exchange 2013 so that, for instance, an incoming client connection can be proxied by an Exchange 2013 CAS to an Exchange 2010 mailbox server. However, the final piece of the puzzle will slot into place when Microsoft releases Exchange 2013 CU1 (cumulative update #1) in Q1 2013, in line with their new servicing strategy for Exchange 2013 announced last week. Given that we are mid-way through Q1, you can assume that CU1 is on the way very soon. Exchange 2010 SP3 also supports Windows Server 2012, which I think will be the most popular operating system for Exchange 2013 deployment, and it is required to co-exist in a hybrid environment alongside the upcoming Wave 15 refresh for Office 365, when “the service” gets to run datacenter versions of Exchange 2013, Lync 2013, and SharePoint 2013....
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