By Microsoft's own admission (before the article was taken off their Knowledge Base), Windows NT and 9x can only be on for 49.7 days - max - before it will crash... of course, most people can't make NT or 9x run for more than a few days

This is not quite accurate. The actual bug was in Windows 95 (still in 98? Don't know). They discovered that the uptime counter rolled over after approximately the number of days you mentioned, and crashed the box. This was discovered, if I remember correctly, earlier this year (it seems that in 3 and 1/2 years NO ONE had ever successfully kept a Win95 box up for that long!).

NT, however, does not suffer from this particular bug. I have a client who managed to keep his NT box up for at least 78 days -- mostly because the machine was so little used (he's an exec, not a geek). After 78 or so days, he had next to no free RAM left for anything. The leaks in the OS itself had plugged the system horribly. Nevertheless, this man did successfully run it for 78+ days.