I just tried the SQL script for getting a useful view of the activesync logs from here:
http://blogs.technet.com/exchange/archive/2006/02/14/419562.aspx
It works well, I used the log parser command to output as CSV:
LogParser.exe -i:IISW3C -o:CSV file:c:\drv\sql\HitsByUser.sql
I recommend you try this tool, certainly gives a better picture of Activesync usage.