I regularly get asked this and I've blogged before on this topic but thought I'd just provide a new article on this topic as we had an internal email debate on this and there were some great resources identified!
I get asked by lots of customers how they can report on their Exchange Activesync usage. The resources below should point you in the right direction!
Exchange Server 2003:
- Exchange 2003 - ActiveSync reporting http://msexchangeteam.com/archive/2006/02/14/419562.aspx
- More on Exchange ActiveSync Reporting with Log Parser - COM object availalbe http://msexchangeteam.com/archive/2006/03/03/421149.aspx
- More fun with Logparser and Exchange logs http://msexchangeteam.com/archive/2007/09/12/446982.aspx
Exchange Server 2007:
- Exchange ActiveSync Reporting Services http://technet.microsoft.com/en-us/library/bb201675(EXCHG.80).aspx