Hrm...  I'm not sure we should be keeping XP-specific code around, let alone adding more of it.  We've already started removing XP workaround, and at some point, I'm going to remove the XP socket pool logic, so we have consistent behavior across platforms, which means we can BSOD in XP under some cases (May be XP SP2 or earlier, not sure).

Ah, ok. That works for me. It's baffling that we have a bunch of users running m52 on XP, but I'm happy to drop this if we're, say, OK with BSOD'ing them.  Thanks.

You may want to file a bug about our install/deployment stuff (I don't know the correct label), to see if we can figure out why/how XP people are running M52, but ending XP support should mean just that.