WSH is only upgraded with IE, and never with OS Service Packs

IE 501 eq. WSH 5.1
IE 5.5 eq. WSH 5.5
IE 6 eq. WSH 5.6 with vbscript.dll build 6626
IE 6 SP1 eq. WSH 5.6 with vbscript.dll build 7426

Versions of IE that comes with "recent" OS versions from the "factory":

Win2K: IE 501
WinME: IE 5.5 (I think)
WinXP: IE 6
WinXP with SP1 included: IE 6 SP1


*Posted in Newsgroup: microsoft.public.scritping.vbscript by Torgeir from Norway 01.05.03