I am unable to send or receive emails from Windows Live after upgrading Windows 10 as you said I needed to do

It didn't work.    It was already on "log on using clear text ....apply then and check ok.  Got any other ideas????

Yeah, that's where it was, and that's where it still is. And that did not solve the problem.

Logging on : Secure Password Authentication

Error message 0x800CCC90 means:

 "Windows couldn't log on to the e-mail server using secure password authentication"

Very few mail servers support Secure Password Authentication these days. Right-click on the account name in the Windows Live Mail folder pane, then select 'Properties'. On the 'Servers' tab, select "Log on using clear text authentication", then click 'Apply', then click 'OK'.

Now try again to send and receive.

Further Details Needed

To enable someone to help, please say which version of Windows Live Mail you have.

To find the Windows Live Mail program version and build, open Windows Live Mail. Then, with the program displayed on the screen, do the following on the keyboard -

  1. Press: Alt+F

  2. Press: B

And say which e-mail service you use: e.g. Hotmail, Gmail, etc.

And describe what you were doing when the problem arose, and give the full text of any error message displayed, including the error number (an 8-digit number). The error number identifies the exact error that is occurring, and is usually essential for solving your problem.

Please note that if you are running any other e-mail program such as Outlook, Outlook on the web, or Mail for Windows 10, I only use Windows Live Mail so can't help with those.

Ran into the same problem with both Windows Live Mail and Thunderbird. Spent the whole day looking for answers and getting nowhere.

There was some comment about needing to switch to the servers to OAuth2, but that didn't solve the problem at all.