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I’ve seen some abnormal behaviour while installing Update Rollup 2 for Exchange Server 2010 SP3.

Error:
“The feature you are trying to use is on a network that is unavailable”

Cause:

The installation refers Exchange Server 2010 SP3 source file (exchangeserver.msi) which I used to upgrade from Exchange Server 2010 SP2 to SP3. This should not be the case but I don’t know why it is referring to SP3 source files.

Resolution:

Either copy Exchange Server 2010 SP3 source file to the asking location or just browse it to the location where it is stored.

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