WSUS “Feature pack” and “Update rollback” exist for one KB, any difference

wsus

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I found in WSUS, there are two updates as per below for KB2977218(Silverlight5.1.30514.0).

http://i.stack.imgur.com/GTHxT.png

I found WSUS description in below but can not catch if there is any difference in module.

Feature packs: New product functionality usually included in the next full product release.

Update rollups: Cumulative set of hotfixes, security updates, critical updates, and updates packaged together for easy deployment.

can anyone help me,

  • Do I need to install both of update ( featured pack and rollup )?
  • If both are same, what is difference between those two items in single KB2977218

Regards, Maka

Best Answer

From the KB article:

this update will be offered as "Update for Microsoft Silverlight (KB2977218)." If a computer does not have Silverlight installed, this update will be offered as "Microsoft Silverlight (KB2977218)."

The latter is categorized as a feature pack because installing it for the first time adds additional functionality to clients. It's not an update.

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