The following command can be used to activate the mailbox features ActiveSync, Outlook Web App and Outlook Anywhere for all users:
get-mailbox -resultsize Unlimited | Set-CASMailbox -OWAEnabled $false -ActiveSyncEnabled $false -MAPIBlockOutlookRpcHttp $true
To reactivate the mailbox features for all users, the following command is sufficient:
get-mailbox -resultsize Unlimited | Set-CASMailbox -OWAEnabled $true -ActiveSyncEnabled $true -MAPIBlockOutlookRpcHttp $false
