Lion mail problem

After a successful upgrade to Lion I have discovered that I now have two Gmail folders in mail. They both contain a full set of messages. There is just one Gmail in accounts in preferences. Can I just delete one of the Gmail folders safely?

As long as you have not selected the option to remove mail from the server once it's downloaded, it should be safe to delete the extra folder. If you set the option to remove mail from the server, I would not delete anything until all mail is backed up.