A simple guide to setting up and using the Apple Mail application which is bundled with OS X. Most users want to know how to send emails, attach photos, and about viewing files and photos they have been sent.
Mac OS X: Mail Basics (length 0:03:04, source: http://www.apple.com/findouthow/mac/)

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Mail is Apple’s bundled email app. It can use most email services and types of email account.

Setting up Mail. MobileMe (now iCloud) automatic. The video skips over settings for other services! (Though my experience has shown Mail to be thoroughly capable if you know what settings are needed, and it already knows them if you are using Gmail, Yahoo, Hotmail, etc).

What you can do with Apple Mail.
Creating a new email message, addressing an email, finding email addresses.
Adding attachments, adding photos from iPhoto, sizing images prior to sending.

Quicklook: viewing attachments without having to open other applications. Viewing photos in emails as a slideshow.

Searching through emails: use anything you can remember about the email you are trying to find using Mail’s powerful search facility.