Use color to make important messages stand out from the rest.
Do you frequently scan lists of messages to find what you're looking for? If so, you may really like the Automatic Formatting feature. For instance, you could make all of the messages from your boss appear in green to make them easily stand out from other messages.
Even if you have thousands of messages in your Inbox, the green ones will catch your attention.
Tip You can also use color to diminish the importance of messages. For example, you could show messages sent to you by way of a distribution list in light gray to distinguish them from messages sent to you only.