When your existing tags become obsolete (or perhaps you were a little carried away with the organization) you may find yourself wanting to delete some of your tags.
It's easy to delete a tag, maybe a little too easy, so you'll want to use this power wisely. Admins can delete tags in two places, but a word of caution: this action is permanent.
Deleting Tags from Settings
To delete tags from your settings, go into Settings > Conversations > Tags. Here you can view your tags in all mailboxes or filter by a specific mailbox.
Deleting Tags from the Manage Tags Menu