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View Thread: Microsoft extends Windows XP downgrade rights until 2020
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    W3bbo

    Heywood_J said:
    W3bbo said:
    *snip*
    There won't be an SP4 because there's no real point. You're just confusing it with some kind of update rollup, which I do expect us to see some time in the coming year or so.

    Forgive my ignorance -- what is the difference between a Service Pack and an Update Rollup?  If there was an SP4,  wouldn't it just be a collection of all the updates that were put out after SP3 up to the present?

     

     

    http://www.zdnet.com/blog/bott/xp-in-2020-not-even-close-read-the-fine-print/2270">http://www.zdnet.com/blog/bott/xp-in-2020-not-even-close-read-the-fine-print

    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?