I am trying to gain an understanding of retention policy in exchange. By the looks we have 2 policies "default archive and retention policy", and "default MRM policy". Looking into both they have various flags for the various email types. I can then see from the recipients list which accounts are subject to which policy.
How do users tag emails to show which retention policy the email should be subject to? And do users have to tag every email with a retention policy? or can they just ignore certain emails and not tag them?
Do you just use the default retention policies, or do you enforce more granualr retention policies (I presume you can create your own)?