If you want to change mailbox features via Exchange Management Shell, you can use the CMDlet set-CASMailbox.
For example, to disable OWA for all users, the following command is sufficient:
Get-Mailbox –database „Name der Datenbank“ | set-CASMailbox –OWAenabled $false
In this way, the features can be quickly configured for all users. The names of the parameters for the other features (ActiveSync, etc.) can be found here: