Outlook Settings - Saving "Expand All Groups"

Outlook Settings - Saving "Expand All Groups"

I have several folders in Outlook that I have sorted based on importance, date, etc. How can I ensure that every time I visit that folder that the groups remain expanded? For instance, if I delete all items of normal or low importance, the next time I get items with normal or low importance, the group is collapsed. I'm running Outlook 2007.