I have lost all my mails, when i tried to move to local folder.

Since no details are provided there is no point to speculate about what may have happened.

How can recover all those mails.

Restore them from a recent backup.

I just wanted to move all mails from Inbox(mail inbox) to local folder. For that i selected all mails. right clicked, -> "Move to" -> "Local Folders"-> inbox(Locally created)

All mails gone from inbox, but they didn't move to localfolder/inbox. Below is file size from Local Folder $ls -l /home/XXX/.thunderbird/xzh5ggke.default/Mail/LocalFolders/ total 24 -rw------- 1 XXX XXX 0 Oct 5 16:31 inbox drwxr-xr-x 2 XXX XXX 4096 Oct 5 16:31 Inbox -rw-rw-r-- 1 XXX XXX 2770 Oct 6 18:14 Inbox.msf -rw------- 1 XXX XXX 0 Oct 5 16:36 sent drwxr-xr-x 2 XXX XXX 4096 Oct 5 16:36 Sent -rw-rw-r-- 1 XXX XXX 3270 Oct 6 18:05 Sent.msf -rw------- 1 XXX XXX 0 Mar 10 2017 Trash -rw-rw-r-- 1 XXX XXX 3148 Oct 6 18:05 Trash.msf -rw------- 1 XXX XXX 0 Mar 10 2017 Unsent Messages -rw-rw-r-- 1 XXX XXX 3071 Oct 5 17:06 Unsent Messages.msf

I don't have any backup from previous

-rw------- 1 XXX XXX 0 Oct 5 16:31 inbox drwxr-xr-x 2 XXX XXX 4096 Oct 5 16:31 Inbox -rw-rw-r-- 1 XXX XXX 2770 Oct 6 18:14 Inbox.msf

This looks a little odd. The file 'inbox' should be your mail file, but the size is 0 bytes. Also the name of the file should be INBOX. Instead you do have a directory Inbox, which really shouldn't be there. If there are subfolders underneath INBOX, you should have a directory Inbox.sbd.

I don't know why this is different for your set up. Is there anything underneath the Inbox directory? Did you do anything you haven't mentioned yet?

I don't have any backup from previous

Why not? Some people really seem to want to learn the hard way why backups are important.