If you’re PST is healthy then you can use the Import/export wizard to import the PST to Outlook first and once your PST file is successfully updated in Outlook. Then you can export it further to a new PST file. If you want to export your Outlook calendars then follow the steps given below
· Open the Outlook
· Go to the bottom, select calendar
· Now tick mark the My calendar Check box
· Go to the open and export option
· Then Click on Import/export wizard
· Select PST and click on Next
· Browse the location to save the PST file and click on finish.
In case your PST file is corrupted then you can use the ScanPST or Stellar Repair for Outlook to repair it first then import the PST to Outlook without any hassle.