The error below is received when searching for mail within OWA:
“Search results may take a long time to appear because Microsoft Exchange Search is unavailable. Results will not include matches in the e-mail body.”
This is due to the full-text index being corrupt. To confirm that the index is corrupt, run Test-ExchangeSearch from the Exchange Management Shell on your mailbox server and the following output will be received:
ResultFound : False
SearchTime : –1
Run ResetSearchIndex.ps1 –force MailboxDatabaseName from the Exchange Management Shell
The ResetSearchIndex.ps1 script is located in the <drive>:Program FilesMicrosoftExchange ServerScripts folder.