I

Importance

The property defining the urgency of a message or other Outlook item. The default setting is Normal; you can optionally change the setting for an individual item or for all items to High or Low.

indent marker

A marker on the horizontal ruler that controls the indentation of text from the left or right side of a document.

Internet Message Access Protocol (IMAP)

An e-mail-handling protocol that organizes messages on the server, and you choose messages to download by viewing their headers.