Windows Mobiles can be configured for Active Sync. Active Sync is enabled for all users by Default in Exchange 2007. For Security reasons its recommended to disabled all users and enable only for the required users

Below power shell enabled and disabled Active for all the users in the exchange Organization

get-Mailbox -resultsize unlimited | set-CASMailbox -ActiveSyncEnabled:$False

get-Mailbox -resultsize unlimited | set-CASMailbox -ActiveSyncEnabled:$True

Below powershell command to enable and disable active sync for given set of users in the text file

Get-content C:\users.txt | set-CASMailbox -ActiveSyncEnabled:$True

Get-content C:\users.txt| set-CASMailbox -ActiveSyncEnabled:$True

Below powershell command to get the list of users who ActiveSync is Enabled and Disabled

Get-CASMailbox -ActiveSyncEnabled:$True

Get-CASMailbox -ActiveSyncEnabled:$False