Exchange 2010 and 2013 have an option called “Retention Policies”. I’ll base the below on what I see for Exchange 2010, but most of not all should apply to 2013 also. Retention Policies are useful if you need to keep your user’s mailboxes clean, as well as trying to avoid a Deleted Items folder with every single email the employee has received in their time with the company. You can work out what the company agrees with for what can and can’t be auto deleted, and save a lot of money on space for both live information and backups. The Retention Policies are made up of “Retention Policy Tags” and these tags “control the lifespan of messages in the mailbox” as quoted by one of the wizards that you configure this in mailbox. The Retention Policy is then targeted at the mailboxes you want to apply these settings to. Maybe not this wizard. It’s worth noting that a mailbox can only have one Retention Policy linked to it, so you need to plan overlapping settings accordingly. So, what can a Retention Policy Tag do? You give it a ‘Tag Type’ which is either a folder in someone’s mailbox (e.g. Deleted Items) or every other folder that isn’t an inbuilt folder. From that definition of what folder the tag is on, you can either set an age limit for all items in that folder, or set the items to never age. The Age limit is a number in days. This number actually means something different depending what Tag Type was targeted. For an email in the Deleted Items folder, it’s based on the date the item was deleted by stamping it at the time of deletion. There’s some caveats around that, so refer to this chart on TechNet which lays out...