<< I've just installed it on an IBM 560 laptop >>
That can't be much fun - Win2k with only 40MB of RAM on a P133? That's like running Win98 on a 25MHz 486SX with 8MB. Not even, because that 486 meets minimum Win98 requirements, whereas your TP560 does not meet the mins for Win2K.
But if you say it's OK, you must have the patience of a saint. I do believe the upgrade went smoothly and everything is supported, though.