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The command that Microsoft provided to me for upgrading the SMS client via the logon script doesn’t work. I did some research and found that the SMSCONFIGSOURCE command is used by CCMSETUP (not CAPINST) and when CAPINST is called, it automatically checks to see whether the client is already installed (which it is) and ends – it never calls CCMSETUP and therefore the SMSCONFIGSOURCE command is never used.

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Still investigating...