Merging calendars in Outlook

I was recently migrating from Hosted Exchange to Office 365. As the number of user accounts was limited I decided to go for the quick and dirty manual data migration. Export the Hosted Exchange user mailboxes from Outlook to a .pst file and import it into the Office 365 user mailbox in Outlook. Very straight forward and easy to do. The migration seemed to have gone smoothly until one of the users noticed that their calendar was missing. How did I miss that?  Continue reading