I just posted an article on the challenges adding feeds with enclosures to Outlook. After a little more digging, I realized that you can send the feeds to other data files. This will help in the mailbox size limit you may have for exchange.
Goto Tools – Account Settings
Select the feed that you want to change locations for and click the change folder button.
Create a new folder in your offline storage. Hey if you don’t have one, you can create a new data file at this time.
Your done. Well almost. It doesn’t move your existing content over. You will have to manually do it yourself.