The default Outlook setting is to only show mailbox\calendar data for 1 year. To change this Outlook setting do the following;
- Open Outlook
- Click on File
- Click on the Account Settings button
- Click on Account Settings in the list displayed
- Double click your email account
- Move the slider to your prefferred setting. The very end of the slider will display all of your emails in Outlook
- Click on the Next button>Click on the Done button>Click on the Close button