Get a users mobile device details using the Exchange Management Shell

Here is a quick command to get the details of a particular users mobile device or smartphone, including the device ID and the time it last synced, etc, using the Exchange Management Shell. When you type the command replace Username, with the name of the user that you wish to examine:

Get-ActiveSyncDeviceStatistics -Mailbox Username | Format-List

Display mobile device statistics using get-activesyncdevicestatistics

Ref:

http://technet.microsoft.com/en-us/library/aa996908(EXCHG.80).aspx