While most of us will see this, and there could be some issues with servers that are time sensitive, the majority of home users should be fine as long as they're computers are up to date on all the patches.

I've been dealing with this at work for the last three weeks. Not just on the linux boxes I control, but also the windows boxes. You can get patches for almost everything. Some things microsoft won't have patches for until a couple of days before the change.

There are going to be some unsupported computers out there, like NT and 98, but I'm sure someone will come up with a patch on their own even if MS doesn't.