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Exchange 2010: EMC initialization failed

When you remove one of your Exchange servers, then you have chance to encounter EMC initialization error.
This is because removed server was chosen as the best to be managed by EMC.
you can delete this mapping and enforce EMC to choose another server.

To erase MMC settings, do the following:
1. Go to the c:\Users\username\AppData\Roaming\Microsoft\MMC
2. Delete “Exchange Management Console” file:

3. Run regedit
4. Delete this key: