[tathougies]

My dad was happy with OpenOffice.org Calc (now LibreOffice), and he loved excel. But, yeah, obviously Linux doesn't run accounting or signature software that is not built for it. That's not a technical issue with Linux of course (see Android), but a lack of proprietary software that runs on GNU/Linux.

[iagovar]

If you are a medium-advanced user with Excel it's not gonna be good with calc.

Linux is only going to be smooth for very basic stuff or if you have de knowledge to troubleshoot it.