Yesterday I checked my email, (Outlook on Office 365) and everything was fine. Yesterday afternoon when I got home from work I went to check my email and when I launched Outlook it was if I was launching it for the first time wanting me to set up my accounts. All of my email address, emails, contacts and calender were completely gone from OL. (Though I found that my files/folders still do exist in my profile.)
The same was true with all of the other programs with Office 365, Excel, PowerPoint etc. When launched they all acted as if it were the first time they had been opened after the initial install. Any files that were listed in "Recent" files were no longer listed, (but still in the "Documents" folder.)
Also, when I went to open my Windows Explorer folder on my taskbar, I got the message that it couldn't be opened, that it had been...