When I added my Microsoft Exchange server account to my iPad mail, it moved all of my calendar history for the past 20 years over to my iPad 2, and deleted them off Exchange. Now when I bring up Outlook, there are no calendar appointments. I've also tried accessing my Exchange mailbox from a browser, just to check that its not Outlook.

So I don't know why iPad/iTunes transferred my calendar, but I need it back on the company's server.

For a bit more background, this occurred when I added Exchange mail account to iPad. It asked my for a server address and login details, and then proceeded to copy everything, incluing a public contacts folder containing 20,000 contacts.

How do I get my calendar back onto Exchange?