Is there a physical limit to opening a thunderbird folder into a new account, either by design, or by fault?
I want to open an old inbox (420MB) into a new account. I have tried just swapping the file over and re-starting TB but it just thinks for a few minutes whilst it decides which 'emails to index' then stops and nothing appears.
I can create sub-folders and add items to that.
If I try to copy and paste an email into the inbox it says the file is in use.