W3bbo said:Heywood_J said:*snip*Service Packs include all previous updates as well as often (but not always) featuring some kind of behavioural change to Windows (which is why you often see software requiring a specific SP level, as was especially the case with NT SP4 and SP6).
Update Rollups are just consolidated installers.
So a hypothetical UR for Windows XP would require you to:
* Install Windows XP
* Install SP3
* Install UR
as opposed to a hypothetical SP4:
* Install Windows XP
* Install SP4
Guess which one requires a lot more development work and testing?
But that's not entirely true.
I just installed a XP machine a week a go and I forgot my CD of XP with SP3, since I had the CD for SP3 I decided to install an old copy (no SP) and then install SP3, guess what, SP3 requires SP1, in the end I waste some time downloading the damn thing anyway.
Juan Zamudio
