I voted xplorer2
because I have it set to start up with Windows and it stays open all day.
Of course, file-shuffling is much of the activity of my day, so it's no wonder.
Second is Outlook because much of my work comes in via email and the boss would not like me switching to Firebird.
Everything else gets opened with FARR, so it's a close but definite third.
If only there were an xplorer2
for my Linux box at home, I would be an order of magnitude happier.
is close, but not really...)