QuickTip: Need to See More Than 1 Year’s Worth of E-Mail in Outlook 2013 (in Cached Mode)?
Go to File>Info>Account and Social Network Settings>Account Settings Double-click the account on the E-mail Tab Under Offline Settings, drag the slider all the way to the right. It should now say All Click Next and Finish. Close Outlook and open it again. You should see the progress in the status bar. Outlook may be a little slow while it is updating your mailbox but once the status shows All folders are up to date, you are good to go.