"ID No: c007007e" Error Message When You Try to apply Exchange 2003 Server Service Pack 1 to an Exchange 2003 Server

When you try to apply Exchange 2003 Server Service Pack 1�to an Exchange 2003 Server, you may receive the following error message:
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Facility: Win32
ID no: c007007e
Microsoft Exchange Setup

The reason why this error message appears is typically because the Exchange 2003 Server previously was in-place upgraded from Exchange Server 2000.

This issue can in most cases be resolved by following the below steps:
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- Log on to the respective Exchange 2003 Server
- Click Start > Run and type Regedit
- Drill down to HKEY_LOCAL_MACHINE\SOFTWARE\Mi�crosoft\Microsoft Integration
- Delete the key: 13F9F3AF-9463-4492�-854A-191CCC441FDB
- Run the Exchange 2003 Server service Pack 1 installation wizard again
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