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