Today I finally retired my 15 years old serial mouse. Now I am using my 2 years old USB mouse which still has been in its original package since i bought it.
Why did I switch? Because I replaced my FreeBSD with Debian on my home Workstation and it does not auto recognize serial mouses anymore and since I am too lazy (I've a full time job and additional to it a part time job) to configure my desktop I just plugged in my USB mouse which works out of the box now :) I must say, I like the feel of the new (optical) mouse. It is much more comfortable than the old serial mouse. It even has a wheel.
FreeBSD still remains on my private main Laptop, my private Webserver and my Workstation at work. While Debian will stay at my Workstation at home and my Gateway at home. And at work there is Linux all around. A Windows XP Prof. is installed in parallel to FreeBSD on my laptop. At work I can also access a Windows via rdesktop. So it's a pretty good mix now :)

Dabei wollte ich Dir doch eine Vintage Maus zu Xmas schenken :)
Und zwar so eine: http://www.vintagecomputing.com/wp-content/images/retroscan/msmouse_large.jpg
I think I'll install OpenBSD or, for a change, NetBSD on my Gateway :) Probably it ll be OpenBSD, which i had on there few months ago too.
@Flo
A Microsoft mouse for Paul? Evil it is.
But, I wanna see photos of both mice (serial/usb), like before and after.
Both mouses look like the same. With one exception: The new one has a wheel on top :)