Uninstall Exchange 2010 error code 1638 workaround

Error encountered while uninstalling Exchange 2010: Another version of this product is already installed. Installation of this version cannot continue. To configure or remove an existing version of this product, use Add/Remove Programs on the Control Panel. The error code is 1638.; }

Such as

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But just use the Add/Remove program on the control Panel to uninstall, Ah, why still prompt this error? Is there an existing update?

Open Control Panel, view installed updates, and discover that there are indeed an installed update

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Follow this updated KB to download the rollup and run it once. Then go back to Control Panel Add/Remove Programs to run the Exchange Uninstaller and uninstall successfully.

Uninstall Exchange 2010 error code 1638 workaround