Forum Discussion
CAS not working with Outlook after OS upgrade
Hello, We have an on-prem Exchange 2010 SP3 environment. It consists of 2x Client Access Servers (CAS01+CAS02) and 2x Mailbox servers (MB01+MB02). The CAS are running a Windows software NLB an...
Update: the reason was very simple. OS upgrade is not supported on Exchange servers, end of story.
The solution would be to create new servers and migrate the environment.