Emails and calendar information has disappeared.
At 3 am all was well with my email account and calendar. I turned off my computer and when I turned it on again at 8 am all my emails and calendar information is gone. It wanted me to set up a new email, just like I never had one. I don't think anything else on the computer has been compromised. I do have a firewall. Any idea what might have happened? Thanks for any help.