Some times it is usefull to get a list of when did devices last sync.

get-mailbox | ForEach-Object { Get-ActiveSyncDeviceStatistics -Mailbox $_.Identity;}| Out-File -filepath c:\powershell\activesync.txt

Or if you want to list spesific devices:

get-mailbox | ForEach-Object { Get-ActiveSyncDeviceStatistics -Mailbox $_.Identity;}|where {$_.devicefriendlyname -eq “Touch_DUal”}| Out-File -filepath c:\powershell\activesync.txt