re :I noticed that a large part of one of my local folders is missing.

I presume by local folders you are talking about the 'Local Folders' special account. So if different you need to clarify.

Please post/upload an image of the 'Folder Pane' which shows everything in 'Local Folders' account.

Then post/upload images that show what is in the profile folder: Assuming you are using Windows OS

• In search type: %Appdata%
• select the %Appdata% file folder
• Select 'Roaming' folder
• Select 'Thunderbird' folder
• Select 'Profiles' folder
• Select name of profile folder
• Select 'Mail' folder
• Select 'Local Folders' folder

Make sure the view is showing all contents in column details format, extensions and hidden files must be allowed. Make window large enough to show all contents - or if necessary post more than one image.

This means I can compare profile with Folder Pane and check to see if appropriate files are missing.

What Anti-Virus do you use ? Is it allowed to scan your Thunderbird profile folders ? Do you use any Anti-Virus or other cleanup program like CCleaner or Wisecleaner that cleans up temp files etc? If yes, then what do you use?

Hi Douglas:

First, what Toad-Hall said :-)

Second, have you tried Thunderbird Troubleshoot Mode? If it works in TB Troubleshoot mode, it's probably a 3rd party issue like an add-on issue. If it doesn't work in Troubleshoot Mode then it may be a Thunderbird bug.

Cheers! ...Roland

Douglas' reply...

MY REPLY First, your instructions do not work because following your path, I go down each line until I reach (Select Profiles folder) Once opened it gives me the names of my 2 alpha numerical profiles and I opened each profile there is no such thing as "Local Profile" folder. The View shows all files, My AV is Bitdefender; I have no clean up software My system is w10 pro x64 I have been using T-Bird for years and installed dozens of updates always using my same system and tools so something seems to be wrong with the update itself. I will wait for your reply Thank you for your support Best Regards Douglas Noades

re :I go down each line until I reach (Select Profiles folder) Once opened it gives me the names of my 2 alpha numerical profiles and I opened each profile there is no such thing as "Local Profile" folder.

I did not mention anything called 'Local Profiles' folder... Once you have selected the 'profile name' folder = alpha numerical profiles You then select the 'Mail' folder, then you will see 'Local Folders' folder which you need to select.

Then upload an image which shows the contents of the 'Local Folders' folder. Also upload an image of the Folder Pane showing the 'Local Folders' section so we can see what you see. It means we can compare and understand the issue.

Also please post all comments into this question, do not create another question.