This question might also belong to the XP-groups, anyway:

I'm running Excel 2000 (SP3) under XP Pro (SP2).

As Excel was newly installed I had no problems maneuvering between different
excel workbooks/sheets (run under the same Excel session) using Alt-Tab.
Somewhere along the road this feature was lost, i am back to clicking the
Window menu to accomplish the same. I have no idea what-so-ever what kind of
settings have been altered.

Creating a local account on the same computer, running Excel from there made
me aware that i once again could use Alt-Tab to switch between the
workbooks. However, changing to another account when running Excel is not an
option... :-)

Thanks in advance!
Kjetil