We have build 8482 running in production/updated on March 24th 2023.
We noticed that one user-acocunt does not complete Mailbox Indexing and the Mailbox-Indexing queue is filling up more and more. It could be that this specific useraccount has issues and probably needs repaired by ST-support - I created a support-ticket for this with RSAA for this issue.
We already deleted IndexV2 and stopped/started the Indexing service and issued manual "Reindex" for the useraccount that does not complete/does not finish indexing.

And today we noticed 98/99/100% CPU-usuage of SmarterMail-windows-service. Users were not able to successfully login by their email-clients like eMClient/EWS and Outlook 2019/MAPI anymore - eMClient keeps asking for entering username and passwort and not going on anymore. So we had to stop the service and restart the Windows-server. After this the service was not upto 100% but around 50% CPU-usuage. After waiting half a hour we again rebooted the windows-server and then SmarterMail was back at normal CPU-usuage, but I am not sure if this will keep at this level... I am not sure if this could have something to do with the mentioned "Mailbox Indexing" queue filling up...

Anyone else seeing this issues with Mailbox Indexing or CPU-usuage at 100% or 50% ??? prior the update the normal CPU-usuage was 0-20%