Seems like WebEx is the reason of the issue...

Hello, would you be so kind sharing some additional info about your findings?
Thank you!

@carlo.anselmi WebEx Productivity Tools in particular. Need to be running 31.11.1.62 or later. There's a LaunchAgent in /Library/LaunchAgents, a plugin in /Library/Application Support/Microsoft, and an app folder inside /Users/Shared that need to be removed if 15.32 is installed.

#!/bin/sh

if [[ -e "//Library/Application Support/Microsoft/WebExPlugin" ]]; then

   /bin/rm -rf "/Library/Application Support/Microsoft/WebExPlugin"

fi



if [[ -e "//Library/LaunchAgents/com.webex.pluginagent.plist" ]]; then

   /bin/rm -rf "/Library/LaunchAgents/com.webex.pluginagent.plist"

fi



if [[ -e "//Users/Shared/WebExPlugin" ]]; then

   /bin/rm -rf "/Users/Shared/WebExPlugin"

fi

@carlo.anselmi We found that previews version of WebEx Prod Tools was responsible for the issue. When not installed, 15.32 works fine.
Seems like we need updated version. I just downloaded 31.11.1.62, and was going to test it.

@RobertHammen Robert , thank you for details and script!

Webex Productivity Tool Version 31.11.1.62 resolved the issue with Outlook 15.32 and .33 (in fast track)

Hello and many thanks for your detailed answers!

Strange enough, if Outlook is open full screen the New Email button works. Upgrading to WebEx Productivity Tools 31.11 now to see if it resolves this issue for me. Thanks for the info!