I think i have written clearly the exact error message and not just "I get an error message". I think i've seen that phrase as a stock answer in another post and you may have accidentally applied it to mine.
OK. Here are the further details of the "Could not write this message to disk"
This happens on both microsoft and non-microsoft accounts
Configuration:
Account: Googlemail ([redacted])
Server: imap.googlemail.com
Username: [redacted]
Protocol: IMAP
Port: 993
Secure(SSL): 1
Code: 800c013e
Configuration:
Account: Hotmail.co (redacted)
Server: imap-mail.outlook.com
Username: [redacted]@hotmail.co.uk
Protocol: IMAP
Port: 993
Secure(SSL): 1
Code: 800c013e
This appears once only on selecting the email and then in the preview pane i get the message below, (for info i am not low on memory or disk space. This is the first app i open with 24GB RAM.)
Message could not be displayed
Windows Live Mail encountered an unexpected problem while displaying this message. Check your computer for low memory or low disk space and try again.
Windows Live Mail Version 2012 (Build 16.4.3528.0331)
Windows Version 2004 (OS Build 19041.329)
Finally, i am able to read emails that were received before the Feature Update 2004, I am only unable to read emails received after Feature Update 2004, hence the title of my post.
I await further instruction, thank you.
Try the solution posted by WLMUser2020 on the equivalent Germain site to this one. (you may need to use Google translate).
WLMUser2020's solution has worked perfectly for me. I can now send and receive emails and view them and view all new emails received. I can now right click view and edit properties of my email accounts (one is a Hotmail account) which would not work after the Windows 10 2004 update.
All seems to be working that was working previously for me in Windows 10 Ver 1909.
Hope this works for you and interested others, as it did for me.
Kind Regards