I have 2k with SP3 and IE6. No problems at all with the OS. And quite frankly, I have not experienced near the problems that some others are with P5. This thing has been rock solid since I went to sp3. Oh, and I have ME on the same partition, they share IE6 and a number of other programs. I know folks say to install different OS's on different partitions, but that costs a lot of disk space. (ok, there is a little tweaking you have to do to get ME and W2K on the same partition, but not much). And of course, this is a homebuilt puter with a hodge podge of parts in it. I guess if anyone was going to experience oddities, it would be me and quite frankly, I can't complain.