I am Dale Hayter, a Microsoft and VMware certified Technical Consultant.

My blog has been built up over the years from my experience of working on an IT helpdesk and also from being out on-site.

Exchange 2010 Catalogs corrupt, EventID 123, ExchangeStoreDB

If you see the error in the event log with an ID of 123 and source ExchangeStoreDB :-

At ‘3/16/2012 11:42:51 AM’ the Microsoft Exchange Information Store Database ‘DATABASENAME’ copy on this server experienced a corrupted search catalog. Consult the event log on the server for other “ExchangeStoreDb” and “MSExchange Search Indexer” events for more specific information about the failure. Reseeding the catalog is recommended via the ‘Update-MailboxDatabaseCopy’ task.

Then you need to reseed the catalogs on the backup server.

Carry out the following steps.

1) Suspend the Database on the backup server. Right click, suspend.
2) Open Exchange Management Shell, Run the command.

Update-MailboxDatabaseCopy –Identity DATABASENAME\BACKUPSERVER –SourceServer MOUNTEDSERVER

3) This will then copy across the catalogs
4) Unsuspend it

Source : Technet