This option controls which address book you see when you open the Address Book (via clicking Ctrl+Shift+B) and when you click the To, Cc, or Bcc buttons when composing e-mails.
The default settings minimize Outlook to the Taskbar, but you can make settings to minimize it to the Tray.
Search Folders let you to access the information in your mailbox more quickly, because, unlike the ordinal folders, they do not dictate that message should belong to a single folder.
In some situation you may want to send your vCard in every message. This lets recipients enter the information in their address book quickly and without errors.
With Outlook, you can send a copy of a contact item in vCard format, a standard format for exchanging contact information. This allows the recipient to import the contact data into a contact management program, assuming that the recipient's program supports the vCard standard (as most do).
For replies and forwarded messages, you can choose to attach the original text, to include and indent the text, or to add a prefix to each line of the original message or reply without including the original text.
Outlook enables you to specify default fonts to use for different situations when dealing with e-mail. Additionally you can individually configure default font settings for composing new e-mail and replying and forwarding.
Creating custom menus in Outlook is a fun feature you can use to create a list of the options you use most often, and then plug them into a menu you name and use yourself.
In Outlook 2003 you wouldn't find a Contact Group because it's called a Distribution List in this version of Outlook, for more details see How to import a Distribution List sent you as an attachment.
Sharing distribution lists can be a great timesaver when multiple people need to continuously e-mail the same groups of individuals (for more details see Sharing Distribution Lists). You can easily import a distribution list that was e-mailed to you as an attachment.