You can release the mouse by pressing alt-shift-r.
If you have windows xp you can use the windows compatiability toolkit to fix the problem of eq not letting you alt - tab out.
You can download the toolkit here
http://download.microsoft.com/downlo...7/act30pkg.exe
once you install it select search - query then search for eq.
Double click on the entry it finds.
right click on EQGame.exe and select disable.
That should fix the problem of not being able to alt - tab out.
but if you don't want to go though all that trouble you can just use alt-shift-r instead of alt tab.