1. Is there any way to undelete the files and folders from a workarea?2. If yes, can it also undelete the files and folders which had not been submitted to STAGING yet?
1. Yes. Look at the versions of the file and revert back to a previous one.2. No.
Smitty has pretty much answered your question. I will add a little more. If neither the folder or any files within that folder were ever submitted to staging, then they are gone. A warning pops up to the user indicating such before they confirm the deletion. "Deleting xyz will permanently remove it. xyz exists only in this workarea and cannot be restored. Are you sure you want to delete this item?"If you do a View / All and Deleted from the menu and you don't see your deleted folder, then it would indicate that none of your files or that folder were submitted. Which means that they can't be recovered. You can also check staging or any editions for versions of the file, but it's not likely to exist based upon your details.If by some chance you were backing up iw-mount during your nightly backups then you might be able to recover it that way. But that would be very unlikely since it's not suggested or necessary to backup iw-mount since your iw-store(s) are already backed up.
Unless you had the files backed up, you're screwed.