The Windows Mobile Report Pack is not showing any device specific information. E.g Device Model, Device OS etc.
The MessageStats Windows Mobile Report Pack will only display device specific information for Windows Mobile 6 devices on Exchange 2007 Mailboxes.
Windows Mobile 5.0 and earlier is not supported.
The documentation details creating a Windows Mobile/OWA IIS Log Gathering against the Active Sync servers. These gatherings have to successfully run and then a Windows Mobile Devices gathering needs to be run against each Exchange server that contains a mailbox store. This is the gathering that retrieves data for the device inventory reports.
In Windows Mobile Report Pack v 1.0 a user needs to create a separate Windows Mobile Devices gathering task for each server. This is scheduled to be addressed in the next release of Windows Mobile Report Pack.