If you use Outlook with an Exchange or Exchange Online account, folder policies such as retention policies apply to the Archive folder. For POP and IMAP accounts, you can create an Archive folder or designate an existing folder to use as the Archive folde

You can create multiple .pst files if you want to archive some folders using different settings. For example, you may want to keep items in your Sent folder longer than items in your Inbox folder. Check the Include items with “Do not AutoArchive” chec

This .pst file will appear as an archive folder in Outlook, where you can put your unwanted messages. In Outlook 2013, Microsoft has streamlined the process so it takes just a few clicks of your mouse to create an archive.