Inbox - No new mail!
Sent Mail - No sent messages! Send one now!
Drafts - You don't have any saved drafts. Saving a draft allows you to keep a message you aren't ready to send yet.
All Mail - You don't have any mail! Our servers are feeling unloved.
Spam - Hooray, no spam here!
Trash - No conversations in the Trash. Who needs to delete when you have so much storage?!
[Gmail] - There are no conversations with this label.
Starred - No starred messages. Stars let you give messages a special status to make them easier to find. To star a message, click on the star outline beside any message or conversation.
Important - (empty)
"Our servers are feeling unloved" is my favorite one :)