Finally, we use three distinct visual styles to highlight certain information nuggets.
A note is useful bit of information: a tip or shortcut or an alternative approach to the task at hand. Ignoring a note should have no negative consequences, but you might miss out on a trick that makes your life easier.
The Important information box highlights details that are easily missed: such as configuration changes that only apply to the current session, or services that need restarting before an update will apply. Ignoring important information won't cause data loss but may cause irritation and frustration.
A Warning highlights vital information that must not be ignored. Ignoring warnings will most likely cause data loss.