Frozen email in Apple Mail

Hi Everyone,
I have two clients who use Macs at the same location. One Mac has OS 10.8 and the other with 10.9 and both have MS Office 2011 for Mac with all the current updates.  Both have email setup as POP accounts.

One day while my clients were working on emails, the lights went out.  When they rebooted, the email they were both working during the power outage came up where they left off.  Those emails are  obviously saved in the Drafts folder but even if you delete them from the Drafts folder then delete them from Trash, they still come up again upon restart of Apple Mail (even if you reboot the Mac).

Any suggestions?
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In the Mail App try to rebuild and reindex mailbox database:

From MailApp menu Mailbox -> Rebuild.

Quit out of Mail app and go to the Finder
Hit Command+Shift+G and go to the following path:

Delete every file that begins with “Envelope Index” (optional but recommended: back up these files to the desktop just in case something goes wrong)
Close the MailData window, then relaunch Mail app to force reindexing

During rebuild and reindex you may experience some performances issues.

Best regards!
PAMurilloAuthor Commented:
Thanks!  I need to schedule a remote session with my client and try this.  Your suggestion looks promising!
PAMurilloAuthor Commented:
Here's the solution as discovered by my client:
Mark the email as Junk.  With it in the Junk folder delete it.

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PAMurilloAuthor Commented:
It is the correct one
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