You can create folders to organize your mail. You can set up rules to move messages to folders based on the sender, other recipients, words in the subject or body of the message, and other factors.
You can use filters and Search Folders to view messages that meet certain search criteria.
Outlook can help you manage your mailbox by periodically archiving old items. Different folders can have different archiving schedules.
Using Microsoft Exchange Server, you can share folders in your mailbox with other members of your organization.