Exchange 2010 mail database create and mount fail

Reference:
Failed to create and mount database exchange 2010

Error message:
Couldn't mount the database that you specified. Specified database: <MailDB>; 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: <MailDB>, Server: <MAIL server>].

SOLUTION:
Microsoft notes that the issue is related to having conflicting Domain Controller and Global Catalogue Server entries.  So do the following:
1.  Open EMC and right-click on “Organization Configuration”.  Choose “Modify Configuration Domain Controller”.
2.  Specify the domain and the DC.
3.  Open EMC and right-click on “Recipient Configuration”.  Choose “Modify Recipient Scope”.
4.  Specify the global catalog server.  Make sure it is the same as the chosen DC.

上面步驟做完後，再試一次錯誤變成
Couldn't mount the database that you specified. Specified database: <MailDB>; Error code: An Active Manager operation failed. Error Couldn't find the specified mailbox database with GUID 'b8974f86-80d6-4cfc-ae68-6b5fa110xxxx'.. [Database: <MailDB>, Server: <MAIL server>].

再次 mount MailDB 卻成功了！