I have 3 CAS/HUB roles with two Mailbox roles in my Exchange 2010 deployment. Up until a few days ago, everything was fine (post SP1 install too). And now, I'm seeing error messages on one of the CAS/HUB servers. OWA was not behaving, it had multiple errors while attempting to delete messages, etc.
After some digging, I decided to remove that host from the HLB, and now everything seems to be fine. I've determined that I'm beyond the normal troubleshooting steps so, I want to decommission that particular CAS/HUB Windows VM, and re-create it.
Would I need to first uninstall the roles on that host before re-creating it? Just wondering what the proper procedure should be since, I've not had the need to do this before.