How to Export and Import a set of rules in Outlook 2010
When you Import rules, they are added to the end of the existing list of rules. You can import only one set of rules at a time. When you export rules, they are saved in a file with an .rwz extension.
4. Click Save.
If you want to import a file that contains rules other than those in the Rules and Alerts Wizard, such as rules that are compatible with previous versions of Microsoft Outlook, click the file type in the Files of type list.