1. On the Desktop there is an icon called RemovePST 
2. Double Left click the icon (This will automatically close outlook)
3. Reopen outlook
4. The PST file can take time to reload

If emails are needed to load in a specific folder then please follow the below article on outlook folder syncing.

https://prioritytitleus.happyfox.com/staff/kb/articles/52-outlook-folder-sync