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It's easy to share the default folders in your Microsoft Exchange mailbox: just give your co-worker permission to the folder. They can view the contents using the File, Open, Other users folder command. Sharing subfolders requires a bit more effort as the subfolders are not accessible from the Open Other Users Folder dialog. Administrators can use  

How to show the sender’s e-mail address and other fields in a column in message list view. Many Extended MAPI properties are added to messages when they are committed to Outlook message store or the Exchange mailbox but Outlook doesn't have a built in way to expose the value. You can view them using a custom configuration form that exposes the value in a custom field.

These tools reduce the amount of space required to store attachments and the amount of time required to send messages by applying various compression techniques. If you use Outlook 2010, see Outlook 2010′s Default Attachment Size for an issue that may cause issues when using these tools. The applications on this page integrate with Outlook.  

You can divide rules into two types - server-side and client-only. Server-side rules are handled entirely by the Exchange Server, independent of the state of the Outlook client. Client-only rules do not execute until the user who created the rule logs in to the Outlook client with the same profile used to create the rule.