Reset the Search Index in Exchange 2019

Rebuilding the Index through deleting files or reseeding the database does not work anymore in Exchange 2019, becaus Exchange 2019 is using BifFunnel aka Bing. The Index is part of the mailbox, so no more index files and directories.

Use get-mailboxstatistics MAILBOX | fl *bgifunnel* and check if these values are not equal 0:


The easiest way to fix an index is by moving the mailbox to another database.

Manual Way:

Open PowerShell (not Exchange Shell) on an Exchange Server with elevated permissions and run these commands:

Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn

Start-MailboxAssistant -Identity <Mailbox id> -AssistantName BigFunnelRetryFeederTimeBasedAssistant

Take Care: The Start-MailboxAssistant Command is case sensitive!!

More Infos: Fixing Search/Indexing issues within Exchange 2019 mailboxes. | by Tzahi Kolber | Medium