I copied the link to the solution after translating it into english. Here it is and it worked for me, after spending an hour fighting unnecessarily with my ISP whose fault it wasn't. I also got a few dozen previously deleted messages reappearing in my inbox and sent box.
Close Windows Live Mail.
In the registry under
Computer \ HKEY_CURRENT_USER \ SOFTWARE \ Microsoft \ Windows Live Mail
create these 3 DWORD entries (I didn't have them) or change them to 1 if available
RecreateFolderIndex = 1
RecreateStreamIndex = 1
RecreateUIDLIndex = 1
Restart Windows Live Mail. Then the message display goes back to normal for me and the 3 values in the registry are reset to 0. Can be left like this.
For me, the account display in WLM with several accounts after the Windows Update 2004 was corrupt. This is also fixed.
Hello L.Heilig,
Thanks for the solution editing the registry works well for Windows Live mail on Windows 10 2004 version.
Regards,