Content Index Update Failed

Hi simsumm,

It appears that you're dealing with a content index issue on your Exchange Server 2016.

To address this problem, consider the following steps:

1. Verify Content Index Status:
Use the Exchange Management Shell to check the content index status with the command:

Get-MailboxDatabaseCopyStatus * | Select Name,*index*

If the `ContentIndexState` shows as `Failed` or `FailedAndSuspended`, it's advisable to rebuild the index.

2. Rebuild Content Index:
If you're not utilizing a Database Availability Group (DAG), follow these steps:
- Stop the search services:

Stop-Service MSExchangeFastSearch
Stop-Service HostControllerService

- Delete the folder containing the content index files.
- Start the search services again:

Start-Service MSExchangeFastSearch
Start-Service HostControllerService

Allow time for the content index to rebuild, considering the database size.

3. Reseed Content Index:
For DAG users, reseed the content index from a healthy copy:

Update-MailboxDatabaseCopy -Identity "YourDatabaseName\YourServerName" -CatalogOnly

Once the content index has completed rebuilding or reseeding, you should observe healthy results.

You can use these links as a reference:
- [Kernel Data Recovery] https://www.kerneldatarecovery.com/blog/resolve-exchange-database-content-index-state-failed/
- [Practical 365] https://practical365.com/exchange-2016-failed-content-index/
- [Frankys Web] https://www.frankysweb.de/exchange-20132016-index-neu-erstellen/