I recently got to use Excel to do some data entry at a non-profit. Excel 2003 sucks.
1) Only one undo.
2) I accidentally modified a cell and entered something invalid. It wouldn't let me quit until the problem was fixed. I couldn't undo it because of problem #1. I had to hit CTRL-ALT-DEL and revert to the last saved version.
3) You can't put tabs into their own window. I ended up copying stuff into notepad then opening the other tab and copying it there. Twice as much work.
4) The presentation is so easy to screw up and so pointless. For example cut and paste removes the borders and formating. When I first got this document half the little boxes were missing a border and there were mixed up fonts all over.
I could go on. It's just a mess. Basically the message for Microsoft is that, "Hey you guys suck. Not just a little bit, a lot. I mean really really suck."