Windows Live Mail stopped working after last Windows 10 update

Sounds like you're on the wrong tab. Did you go to the File tab>Options>Email accounts, then clicked on "Properties"?  If so, that's wrong.

You need to go to the Accountstab> then Properties>then the Servers tab.  There you can set up the IMAP server,

Starting back at Propertieshere's how mine is set up:

CAREFUL! I have a hotmail account (it somehow goes through Outlook), so these details might not be right for you,

General:

Mail Account: Your account name.

Name: First Last

Organization: blank

E-mail address: Your email address

Reply address: blank

Check "Include this account ..."

Servers:

My incoming mail server is a IMAP server.

Incoming mail (IMAP); imap-mail.outlook.com

Outgoing mail (SMTP): smtp.live.com

Email username: ******@something.com

Password: **********

Check Remember password

Bullet Log on using clear text authentication

Check My server requires authentication

Settings> Bullet Use same settings as ...

Security:

Two "Certificate" boxes - left blank.

Algorithm: 3DES

Advanced:

Outgoing mail (SMTP):  587

Check This server requires ... (SSL)

Incoming mail (IMAP):  993

Check This server requires ... (SSL)

Server Timeouts

   1 minute

Unchecked Break apart ...

IMAP:

Root folder path: blank

Check Check for new messages ...

Check Store special folders on IMAP server

Sent items path: Sent

Drafts path: Drafts

Deleted items path: Deleted

Junk path: Junk

Good luck.

When I reinstalled my hotmail account after reinstalling WLM, I didn't use manual setup, and I couldn't   go to the setup step for manual setup without deleting the account and then adding it again using manual setup.  It is now working again.  When it started working again after it downloaded quite a few files which took a long time, I received your last reply.  I really appreciate your help.  I am saving these links in case this happens again.

It works!!! Just did this for the Windows update in April 2021. Thanks you SO much!

Thanks Louie, 

This worked for me eventually, but as a novice in the registry area (if there's a way to get it wrong someone will discover it!) I initially created 3 DWORD entries as 

RecreateFolderIndex = 1
RecreateStreamIndex = 1
RecreateUIDLIndex = 1

not

RecreateFolderIndex
RecreateStreamIndex
RecreateUIDLIndex

before double-clicking on new DWORDs and changing the 0 to 1 in the new small window. A picture posted in the chain also helped me spot my error (a picture paints a 1000 words!)

Still I now have O365 Outlook set up to see our emails in emergency too, now waiting for the next Windows 10 Update to see what will not work next!

Thank you very much for your post and for others who have posted here to help.

Cheers,

Tom

Restart Windows Live Mail