I have switched from Outlook to Thunderbird (actually Betterbird) and use an extension that creates links to selected messages. The link looks like this:  

thunderlink://messageid=684f0a63aaea3_1234a185110c2@deployment-background-default-857f9f5679-m8… 

If I add this link to Office, e.g. Excel, and click on the link, it opens my selected message. However, when I add the link to IQ, and click on the link, it tries to open Outlook.