We just switched mail hosting companies/servers at work. Old server has been in place for years. All calendar/contacts/etc where synced from that server across my iOS devices. I added the new account info and it picked up where the old one left off. This past weekend I completed the data migration to new server. Once I was finished, I deleted the account on my iPhone and in Outlook for Mac 2011. Now, everything works great EXCEPT all contacts are gone and most of my calendar invites are gone. Wasn't sure where else to put this. Thanks for the help.