This morning when our Exchange server came back up after a planned shutdown, it couldn’t mount his database.
The error message I received when trying to mount the database was:

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Microsoft Exchange Error
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Failed to mount database ‘Mailbox Database xxxxxxxxxx’.

Mailbox Database xxxxxxxxxx’
Failed
Error:
Couldn’t mount the database that you specified. Specified database: Mailbox Database xxxxxxxxxx’; Error code: An Active Manager operation failed. Error: The database action failed. Error: Operation failed with message: MapiExceptionNotFound: Unable to mount database. (hr=0x8004010f, ec=-2147221233)
[Database: Mailbox Database xxxxxxxxxx', Server: <FQDN Server>].

An Active Manager operation failed. Error: The database action failed. Error: Operation failed with message: MapiExceptionNotFound: Unable to mount database. (hr=0x8004010f, ec=-2147221233)
[Database: Mailbox Database xxxxxxxxxx', Server: <FQDN Server>]

An Active Manager operation failed. Error: Operation failed with message: MapiExceptionNotFound: Unable to mount database. (hr=0x8004010f, ec=-2147221233)
[Server: <FQDN Server>]

MapiExceptionNotFound: Unable to mount database. (hr=0x8004010f, ec=-2147221233)

Apparently this could happen when there is a mismatch between the value of the ConfigurationDomainController parameter and the value of the PreferredGlobalCatalog (see: http://support.microsoft.com/kb/977960/EN-US).

After executing the command “Set-ADServerSettings -PreferredServer <FQDN Domain Controller>, the database could be mounted again.