My mail is missing,, there are no messages in my inbox or it's sub folders The system recently did an update but it was ok after that.. now everything has gone... I can log into my provider and see my old emails... so it seems it's a Thunderbird problem Currently new emails are arriving,, but all the old ones are gone..

I have now restarted the machine and now the new emails I have been accumulating are gone also,,, I have gone into my profile and can see the Mail folder is over 2 GB,, so I think all my old mail is there but it is not being addressed correctly by the application. can anyone assist please