Software Distribution Service--Still wondering

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Can anyone answer the original question: What is Software Distribution Service? (P.S. I just re-nuked my hard drive, refused to install anything that has an expired security certificate--including IE7--and Software Distribution Service has not re-appeared on the System Restore Points.)

I am sorry, but I didn't know there would be a different name on the thread. I will try to make sure this time it has the same name, but it looks as if it may be different yet again! That's a question for another day.

Thanks.

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