Restore full header info for Google based accounts in Outlook for Mac.
with the latest version of Outlook for Mac, view source does not return the service information in the header. if you connect via an imap account to a google account, it still works. But with the new api to google, you only get the body and sender info. This makes it hard to determine the source of spam and other message by tracing the IP addresses of mx servers that the message went through. google provides this information on their website. so we can still get the info, but this is an extra step. especially when you can still get this from exchange and imap accounts.
The full header is extremely important to IT for troubleshooting, and needs to be re added for google accounts.
I have confirmed with support that Engineering told them that it was designed this way to hide that info.