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Event ID: 9842 Source: MSExchangeISMailboxStore

Function CISearch::EcGetRowsetAndAccessor detected that content indexing was disabled for database "Mailbox Database ......." because of error "0x80041820" from MSSearch.
In my case, I had to remove the Search index catalog and rebuild it. Used the Exchange Command Shell and ran  these 2 scripts that need to be located in c:\program files\microsoft\exchange server\v14\mailbox\scripts

.\ResetSearchIndex.ps1 -force "Mailbox Database .........."

Detailed instructions can be followed at EV100271 (Searching via OWA or Outlook Online Mode Fails).

Note: the command
.\ResetSearchIndex.ps1 [-force] <dbname> [<dbname>]...  translates to
.\ResetSearchIndex.ps1 -force "Mailbox Database .........."

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