that WinXP SP2 is "mostly, safely installed" - far from it. Our current poll shows that almost a quarter of the people who have responded are going to wait for a while, and if you add the number of people who have tried and had to uninstall the Service pack you have a third of all respondents who would probably like to update but haven't. I think we'll keep the dedicated forum running for a while yet, it's pretty busy there.
As for Windows 98SE - we can deal with any problems in the normal way, via the Helproom. We don't see too many of them now, and I think the numbers will rapidly fall, not only because people will be upgrading, but because most of the computers that had Win98SE installed are approaching the end of their life-cycle by now. These machines will be replaced with new, WinXP machines, or upgraded with new components and the newer O/S. Obviously there are going to be people who don't upgrade for one reason or another, but they'll increasingly find themselves in a minority as time goes by, and as I said, we can resolve their problems in the Helproom.