Our company has moved to Office365 and we're starting to apply a retention policy. In order to make sure all emails get properly judged (plus other reasons), we are eliminating offline email files. On our PCs, this is handled by group policy. I am unable to find how to do this with Mac computers, which might mean it isn't possible. Can anyone that knows for sure chime in and end my struggles?

And by the way, please use small words as I'm a PC guy, very uneducated in Mac-speak.