[Swordmaker]

and of course Clippy, who BTW was code-named "TFC" during development. Rumor has it the acronym stood for "That Fine Clip", or something like that...

I'd heard another coinage of the working name. . . "Too F'n Cute". . . but that's probably just a rumor from the gutter. . .

[dayglored]

Actually Sinofsky claimed that it was "That F'n Clown":

"...the Office Assistant was famously named TFC during development. The "C" stood for clown. I will let your active imagination figure out what the TF stood for..."

http://blogs.msdn.com/b/techtalk/archive/2005/12/16/504872.aspx