When you ask a question, please supply some information, so we can understand your particular setup. Even if you have asked a question before always include helpful info.

What OS are you using ? Windows 11, MAC, Linux etc ? What version of Thunderbird are you using ? Did you get download and install Thunderbird from the offcial website :

• https://www.thunderbird.net/en-US/thunderbird/all/

Or did you get the download from elsewhere eg: Windows Apps Store, Flatpak, Snap etc ?

Are you talking about an IMAP or Pop account ? You mention 'subscribe' so I would guess Imap, but need you to confirm.

You say 'I made a folder' - but where ? A new top level folder in Imap/Pop account or a subfolder to top level folder ? Or did you create a folder in the 'Local Folders' account ?

What server are you talking about ? eg: gmail, yahoo. comcast etc? Logon to the webmail account via a browser, do you see the folder you created? Upload an Image showing the list of folders as it would be useful.

In Thunderbird

• Right click on imap account name folder in Folder Pane and select 'Subscribe'
• Then click on 'Refresh' to ensure it's up to date.

What do you see in that list ? Does it match the folders you can see in the webmail account ? Upload an Image showing the list of folders in Subscribe list.

I understand. I use Windows 11 and I created a folder "April" in my email. I moved several emails into that folder for later use. Now, that folder and all the contents are gone.