Using Classic Outlook on Windows for personal email, calendar, and contact management
Suspending/pausing our AV didn't do anything - the Symantec. AV needed to be updated to v14.3
click -then return pops out the window :) -
you're not running Symantec (SEP) 14.0 by any chance? - we'd been having similar problems and finally got the 14.3 update - the file causing the problem was sysfer.dll -
all Outlook/Edge/Chrome/Chromium/ Edge View2/etc./etc. problems have now gone and everything is working fine.