[ubuntu] Cannot move mail & folder windows

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http://ubuntuforums.org – I tried to do a search for this, but everything was about Windows, not windows (what else do I call them?). I had a folder and my mail set up side by side, a la Windows 7, and now I no longer am able to grab them at the top to move them around my desktop. Also the close, minimize and size buttons no longer show on folders or Thunderbird. I'm pretty sure there's a keyboard shortcut that will let me move them so I can get the close, minimize and size buttons, but I don't know what it is. TIA ~Faith (Hardware)