Sorry if this is a really dumb question, but here goes. I run Office 365/Office 2011 on a Mac Mini. The only consistent problem I have is that when I leave the computer for, say, lunch, or to run errands or what have you, I almost always return to find that the Outlook window moves in such a way that to return it to center screen I have to shut it down and restart.

I run Outlook continuously, usually maximized. When I return to the computer after an hour or two, the window almost always has shrunken to a quarter of the screen and is locked in the top left of it, so far to the top right that I can't access the x - + buttons. When I drag the window to the middle of the screen, it immediately jumps back into the left corner.

Any idea what might be causing this to happen?

Thanks.
I think this is a dumb question, but can't figure out how to manage (edit or delete)contacts in my 2010 or 2013 outlook program. I really need to update my address book, but when I actually go into edit contacts and delete people, it does not seems to save. What am I doing wrong?