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Ben, The team that monitors this forum supports the Open Specifications which can be found here: http://msdn.microsoft.com/en-us/library/cc203350.aspx. We support the current version of ActiveSync that ships with Exchange Server 2007, which is version 12.1. Older versions of ActiveSync are supported through Microsoft Partner Advantage Services.I hope this information assists you.Dominic SalemnoSenior Support Escalation Engineer