CCleaner to me is the nuclear option with any problem. It's more likely Win 10 trying to pimp it's crappy Windows Store apps.
Is it 32-bit Outlook? Have you tried http://www.officetooltips.com/office/tips/how_to_modify_default_mail_client_in_windows_10.html -- Alan Bourke alanpbourke (at) fastmail (dot) fm On Tue, 1 Aug 2017, at 07:45 PM, [email protected] wrote: > On 2017-07-26 11:06, Alan Bourke wrote: > >> It offered SMTP, MAPI, and Extended > >> MAPI. > > > > If you can make it use Extended MAPI then you shouldn't have an issue > > sending with Outlook. > > > computer specs: Windows 10 Professional, 64-bit > > I tried using Simple OR Extended MAPI but I get this error: > https://www.screencast.com/t/OR1m3sOj4I > > I also get that error OUTSIDE of the application trying to email. I > created a test.txt file on the desktop, right-click and say "Send to > Mail Recipient" and I get this message. I go into the Default Programs > and Outlook 2016 is listed as the default mail program, so not sure why > it's saying there is none. > > Perhaps I should try CCleaner to clean up the registry? > [excessive quoting removed by server] _______________________________________________ Post Messages to: [email protected] Subscription Maintenance: http://mail.leafe.com/mailman/listinfo/profox OT-free version of this list: http://mail.leafe.com/mailman/listinfo/profoxtech Searchable Archive: http://leafe.com/archives/search/profox This message: http://leafe.com/archives/byMID/profox/1501616547.2443703.1059983688.13b65...@webmail.messagingengine.com ** All postings, unless explicitly stated otherwise, are the opinions of the author, and do not constitute legal or medical advice. This statement is added to the messages for those lawyers who are too stupid to see the obvious.

