I have a client who can’t open .MSG files with a brand-new Office 10 Pro system, and gets the following error when he tries (using Outlook 2016, installed from Office 365):
Either there is no default mail client or the current mail client cannot fulfill the messaging request.
You might think “aha, I just need to go into the control panel and fix either file associations with .msg files, or perhaps MAPI settings.” You would be wrong. Nope, you’re gonna have to delete a registry key, because of course you are. You’re using Windows!
Open this registry address in regedit:
And delete the key with Data value of “Microsoft Windows MAPI Preview Handler”.
Poof. That’s it. No more errors, stuff opens as it should. Yay.
2 thoughts on “Fixing Outlook 2016 “Either there is no default mail client…””
Thank you so much for the clear and excellent solution to one of the most annoying glitches for which I could find no solution. It even took me months to come across yours!
Same issue (and fix) came up for me in O365 v2019. Thanks.