I’ve just been given permission to announce we’re targeting the release of the updated MAPICDO which will support Exchange 2013 to coincide with the release of Exchange 2010 SP3.
Exchange 2010 SP3 was announced a while back on the Ehlo blog. As you can see from that announcement, SP3 provides much needed changes to allow for coexistence between Exchange 2010 and Exchange 2013. The updated MAPICDO is part of this work.
I don’t have dates for SP3, but you can track the Ehlo blog for that.