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Event ID: 118 Source: MSExchangeSearchIndexer

Level
Description
Exchange Search Indexer has temporarily disabled indexing of the mailbox database EX24R12 (GUID = 6644034b-2058-478e-bfde-442423cce41b) due to an error (Microsoft.Mapi.MapiExceptionMdbOffline: MapiExceptionMdbOffline: Unable to read events. (hr=0x80004005, ec=1142)
Comments
 
If a database is dismounted, this event may be recorded.

From a support forum:

I'm able to resolve the issue by running:

Update-MailboxDatabaseCopy MDB\Server -CatalogOnly

However, I cannot identify the cause of the problem.

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