Microsoft has released security updates for vulnerabilities found in any version of:
Exchange Server 2013
Exchange Server 2016
Exchange Server 2019
These updates are available for the fol...
Updated Feb 24, 2022
Version 3.0
Blog Post
The resource issue maybe also due to journaling mailboxes themselfes. The larger the mailbox and the more mails it contains, the slower can exchange process it.
A thing to consider is how large you allow it to grow, how often do you rotate those mailboxes, how often you dump the content of them and archive it ( whether you do it by hand/with script/with 3-rd party app )
Long ago, there were some unspoken limits, which I've applied myself>link still up so posting it https://support.microfocus.com/kb/doc.php?id=7019380
If the journal mailboxes are not an issue, then the best possible way to process this case i:
- undo of update on one of Transport mailbox servers and check the queue status/journaling issue and perform check
- if the issue is not in-place - create a ms support ticket and process with them; if you don't have any support contract you can pay up front and if the issue was indeed a bug in msexchange - they will refund you
Regards, Hubert