Need to know how to remove ALL previous Outlook settings in Registry and file locations (cross posted)

Question

Problem: I cannot get a newly installed Outlook 2013 to connect to the [online Office 365] server with old [non-domain] logon profile. That is my issue, and what I'd like to fix. (There's some services and settings on the old profile
that cannot be easily duplicated. Also, I'm just enough annoyed by this to ask for suggestions.)
Background: I upgraded an existing Office 2007 install of several years back to Office 2013 on an continuously used [non-domain] user profile (I needed connections to several Exchange accounts at various domains I remotely admin
and was tired of logging on through OWA, so it was time to upgrade). Up to Sunday last, I have never had issues with Outlook and Office 365 connections to that account; upgrading Office 2013 "killed" my outlook.office365.com connection to emails.
Testing: I created a new [non-domain] logon profile, and Outlook 2013 connects to my outlook.office365.com account just fine with the new logon profile. To repeat:
there were NO connectivity issues in connecting to my Office 365 account in the
new [test] logon profile with Outlook 2013, and using Outlook 2013 on the new [non-domain] profile.
The problem is profile specific, to an older existing profile (I'd like to use).
Just FYI: my [vanity] domain tests just fine with the Exchange 365 online tools. Office 365 works. OWA works. Outlook 2013 works (in the new logon profile). Mobile devices work.
There are no major problems with the domain name in MXToolbox, or Microsoft Remote Connectivity Tester. Both Windows and Office are fully patched on my workstation. There's no malware.
The problem is something in my older logon profile. Something somewhere locally to that logon and/or Outlook-specific profile is keeping it from logging into the [Office 365] mail server. I just get the typical "cannot connect to
the server" error.
What's Needed: So what I need is a link to a webpage (or pages) that details ALL [existing] Outlook/Exchange settings that are profile specific ...so I can
manually remove them from the Registry, from the drive, etc.
...something on the order of "...remove all profiles under
HKCU\Software\Microsoft\Windows NT\CurrentVersion\Windows Messaging Subsystem" and "...delete all files in
C:\Users\username\AppData\Local\Microsoft\Outlook" (neither of which fixed the issue, whatever the real issue may be ...but that's all I found so far that seemed pertinent). Anyways, "stuff"
like that.
Alternatively, if someone knows what Registry keys, other settings, etc., I can export/import from the test logon profile to my "real" logon profile(s), that would be worth a shot, and greatly appreciated.
Or maybe just some google search suggestions that might find the above links (listing error message contents hasn't been useful: too many hits).
Me: I'm a sys admin with over 30 years experience. I'm not looking for suggestions on how to set up an Exchange account, or an Office 365 account, or to setup a new mail profile or logon profile (or to remove either of those), or to add
a new email account (manually or with auto-discover), or to remove an old account. None of that applies and/or has worked in this case.
Thanks in advance for your interest. I really need a knowledgeable wizard, since I'm looking for a solution to a complex issue. My own googling and troubleshooting has just turned up the usual noob' stuff. At this point, I'm at a loss. The well is dry.
Update:
This question is cross-posted from the general "answers" forum (at the suggestion of a moderator).
Update: I also came across
this page of "advanced" Outlook settings (and it hasn't helped so far, either).

Answer 1

I too, for over 30 days have been trying to find an answer as my situation is as similar as it gets.  I too have tried all and everything as you have.
How I wish there would have been an answer to your question.  It would have answered mine as well.
Seems typical to microsoft "help" unless it is the usual noob response and/or "more clarification" (I with no tech degree understood exactly what you refer to) the only response is well, just no response......