This is a follow-up to a question I asked recently that got too long and unwieldy. Here's what happened:

1. I created a new email account in TWC webmail as a required precursor to a new Outlook account, using the exact same configuration as my other two accounts.

2. The new email account would send but not receive, but only on the MBA - I got continual "invalid user name/password" error messages - except that the user name/passwords were correct, and they worked fine in webmail, in Mail on the MBA, and on my iMac/10.6.8.

3. After hours of attempts to make it work - including fruitless calls to TWC/Roadrunner and a lot of generous help here from Cortig/Corentin - I somehow deleted all of my emails on the MBA. I think it was because I deleted all three email accounts so I could start over.

4. I recreated all three accounts again - correctly - and imported the emails from the iMac - that worked fine, though Outlook forced me to export ALL emails, which went back to 2002! You can imagine. There was no option to choose which folders to export.

5. That's when all three accounts refused to send or receive - the invalid username/password error message. Outlook on the MBA was now useless.

6. I thought that maybe having to import so many old emails had corrupted Outlook on the MBA, though it's the same Outlook 2011 as on the iMac. I thought it might have something to do with El Capitan.

7. So I deleted all the emails I had just imported. (I tried first to do this by deleting the accounts, but unlike the first time, when the emails disappeared after the account deletion, this time the emails were still there, though the accounts were gone. Just another addition to the pile of weirdnesses.)

8. Then on the iMac I dragged selected folders (instead of everything) into a flash drive and in the Info panel told it to open everything in Outlook 14.6.0 - which was the default and only choice anyway.

9. I then tried to drag the emails from the flash drive into Outlook on the MBA. This didn't work - they wouldn't drag, just bounced back. I half suspected this would happen because all the emails are .eml files instead of .mbox or .oml (the export format).

10. Not that my totally empty Outlook inbox matters - since none of the accounts will do anything anyway except tell me I'm using an "invalid username/password."

11. The bottom line - I've had no email in Outlook on the MBA for two days. Mail works - though I've never used it, I did create the new account there to see if it worked. It does - but I don't have my two other accounts there, and those are the ones I use for personal and business matters.

I thought maybe it had something to do with El Capitan not working well with Office 2011, but it had worked seamlessly well ever since I upgraded from Mavericks to El Capitan many months ago. It started screwing up only when I created that new account.

Does anyone have a clue what's going on? It's all a mystery to me because, again, all the username/passwords/configs are correct.

Sorry that this got so long as well - it's been days of trying one thing after another, with no solution. I'm resisting taking it to the shop because it's $120 just to drop it off. So thanks for any help.