Powershell - get a list of all connected ActiveSync devices to your Exchange

$devices = @()

$mailboxes = Get-CASMailbox -ResultSize:Unlimited | Where-Object {$_.HasActiveSyncDevicePartnership -eq $true -and $_.ExchangeVersion.ExchangeBuild -ilike "8*"}

foreach ($m in $mailboxes)

{

    $devices += Get-ActiveSyncDeviceStatistics -Mailbox $m.Identity

}

$devices | Export-Csv c:\temp\DeviceStats.csv