1. Open Outlook 2010, then select File.
2. Click Open, then select Import.
3. In the Import and Export Wizard, select Import from another program or file.
4. Select Outlook Data File (.pst).
5. Click Browse, then select the Outlook data file (.pst) meant for importing local calendar data into Outlook 2010.
6. Select Replace duplicates with the items imported, then click Next.
7. Expand the user's folder, select Calendar as the target location for this import, then click Finish.
8. The targeted calendar should now display of list of appointments.

For assistance with exporting from your email client, please click here.