Compliance: EXCERPT from Microsoft® Exchange Server 2013 Inside Out

Preserving information

An important part of being able to achieve a compliance strategy is the ability to preserve information. Retention policies help somewhat because they can automatically move information into archive mailboxes. However, they also remove information through tags that require items to be moved into the Recoverable Items folder or permanently deleted. Items held in the Recoverable Items folder will eventually be removed from the database and permanently deleted.

Some method is therefore required to limit the work of the MFA as it attempts to keep user mailboxes under control. The mechanism available in Exchange is called holding; any MFA processing that might delete an item is restricted, and (sometimes more importantly) users ...