AutoArchive in Outlook moves old items to a local archive data file to reduce the size of your mailbox. Global AutoArchive settings apply to the entire account, but you can define a more precise policy for some folders.
This rule is useful if you receive a lot of messages from your colleagues and use rules to copy or move correspondence to the specific folders (like Rule to copy all correspondence on some subject to the specific folder or Rule to move all correspondence on some subject to the specific folder). Unfortunately those rules do not work for messages with an empty subject, but you still can create a rule to send an automatic response if the incoming message does not have a subject.
Usually, Outlook users use folders to organize messages, but you can also use colors, fonts, and styles. For example, you can assign a unique color to all messages from a particular person, e.g., your boss. Now, you can easily spot the emails from that person in your inbox and other mail folders.
Outlook displays only a small subset of the available fields for messages in the Inbox and other Mail folders. The default view for the Inbox is Compact, and this view does not display any columns. You can view multiple columns in the List view and add columns, such as Cc or Sensitivity, that show additional information.
Outlook proposes next shortcut keys for easy and quick work with e-mails: