Here are some Email Retention Policies...

Office365 Retention Policies

Exchange Online, which comes bundled with Office365 , has a very unique feature for Email compliance . It is called Retention Policies.

It offers two types of policies: archive policies and delete policies . Exchange Online offers retention policies to help organizations reduce the liabilities associated with email and other communications. With these policies, administrators can apply retention settings to specific folders in users' inboxes. Administrators can also give users a menu of retention policies and let them apply the policies to specific items, conversations, or folders using Outlook 2010 or later or Outlook Web App.

Exchange Online offers two types of policies: archive policies and delete policies. Both types can be combined on the same item or folder. For example, a user can tag an email message to be automatically moved to the In-Place Archive in a specified number of days and deleted after another span of days.   

The article has been contributed by Suresh Ramani, Techgyan