Mail.app - How can I Delete & Reinstall It

I'm having a Mail.app problem. I backed up the whole Archive (Saved it to USB Drive) and wants to delete the whole thing and remove it from my system then re-install it.
How can I do it ?
I'm using Mac OS X 10.8 latest version - iMac Machine.

System Preferences - Language & Text - Formats - Customize  allows custom date/time formats which can include the day of the year...
If say, one of the date formats was altered to include that - Mail might  show it, while say Finder & other apps use a different, longer/shorter format, without the added day of the year. choosing a different region, or inspecting the 'custom' region, should indicate if that's the case here.

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