We have an issue where PC users on our domain are repeatedly getting password pop-up boxes or certificate pop-ups when Outlook is open.
If they accept the certificate and/or enter their password Exchange connects to Outlook and works fine, except it happens around 10/15 times per day per user.
I've tried restarting the SBS box while all client PC's were shut down, and also I've tried 'installing' the certificates and removing/replacing the details in the local credentials manager, still can't make any sense of it.
I suspect this is a server problem as it does affect all local PC's, although we have a couple of users who also pickup email on their Android/iPhones which seem to work without issue.
any guidance appreciated!