Here I found to use on all versions of Windows namely the "iemaximizer.exe" freeware utility. jiiSoft :: IE New Window Maximizer
This works on the 64bit as well as 32bit Windows XP, Vista, 7 and previous versions of IE 6, 7. and even the 64bit IE 8. You can opt to have it start with Windows and hidden in the system tray as well as starting it up manually each time you go to use it.
It also can be set for full screen for both IE and OE or Windows Mail while I would advise against that option for most if you decide to try it out. I got sick of clicking the maximize button for every new window a few years back for opening second windows from links and came across this one.