You receive the error Setup failed while installing sub-component SMTP Service with error code 0xC103798A when installing Exchange Server 2003 Service Pack 2

The Exchange Server 2003 SP2 Setup is referencing an incorrect location for the exchmem.dll file in c:\windows\system32

Rename the file exchmem.dll in the folder c:\windows\system32 to exchmem.old and click on Retry in the hung setup.

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