Uninstall Exchange 2007 from programs. (uncheck Management Tools)
Restart your computer.
Install Exchange 2010, selecting only the Management Tools. Run setup.exe located in the Exchange 2010 installer ISO. Click next until it begins the installation.
The install will error out and say to restart. After restarting run setup again.
You will be asked if you want to use your previous settings. If you select yes you will get past the error.
Open MMC and click “File>Add/Remove Snap-in…”
Then go add the Snap-in to MMC for Exchange 2010 and remove the old Exchange 2007 Snap-in.
Recommended Reference Books
Microsoft Exchange Server 2010 Best Practices
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