Well, I was able to figure this out. It appears that when the Software Update Server gets a new list from Apple, it removes all the old updates from the list of those available to your clients. If the “Purge unused/legacy software update packages automatically” setting is enabled, then it will also delete the old updates off the server.
So when iTunes 9 came out the older iTunes version was no longer available to the computers even though I had not yet enabled the newer iTunes. Not the best way for it to work, but at least I know about it.
— Brian Wells
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