We have 1000 clients network and most of the clients having thunderbird installed (latest version) and configured , since last few months we started getting complaints that some of the local folders not showing their content mail in the system , we tried to repair folder does not work, we tried renaming .msf does not work.. when we see the some of the local folders mail they appear in the list but if you try to open it it opens blank and after trying troubleshooting steps thoes mails getting disappeared.. please assist..