Yes. You can archive or backup mail from hosted and on-premise MS Exchange setups. This ensures that a read only and tamper proof copy of every mail is saved at a secondary location.
You can use the journaling feature of MS Exchange to forward a copy of incoming and outgoing mail for selected users from the MS Exchange server to Vaultastic.
Mails from all MS Exchange versions which support journaling can be backed onto Vaultastic. This includes MS Exchange 2007, MS Exchange 2010 and MS Exchange 2013.