Redmond, we have a problem here. You see, I'm finding that patching Windows XP systems to Service Pack 2 (SP2) has all of the
troubles and concerns that come with an operating system upgrade instead of a major patch.
Technically, I can handle that, but I suspect there are a lot of VARs (value-added resellers) and system integrators out there who don't realize yet that implementing SP2 properly is a huge job. More importantly, I know that most end-users aren't aware of just how difficult upgrading their businesses to SP2 is going to be.
Source : OsOpinion