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Event ID: 2155 Source: MSExchangeMTA

Source
Level
Description
An MTA database server error was encountered. Failed to read attribute information (AAT) for object 02000001. Database server error code: 2127. [DB Server MAIN BASE 1 29] (14)
Comments
 
This issue may occur if incorrect values exist for the location of the MTA database path in the registry. See ME324026 for more details.

See ME175495 for information on how to perform an MTACHECK.
As per Microsoft: "This issue can occur if one or more .dat files from the \Exchsrvr\MTAData (MTA Database) directory are missing when you attempt to start the MTA." See the link to ME182009 and ME274285.

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