Exchange 12 MMC3.0 installation bug

There is a known issue when installing E12. E12 requires MMC 3.0 and .NET Framework version 2. Even with MMC 3.0 installed, installation fails:

“Exchange Server ’12’ requires Microsoft Management Console 3.0.”

There is a workaround for this problem. Open the registry and navigate to the following:


Add a new key:


Works first time with this key. Checkout the Exchange Team blog for more details.

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