Recently I made the decision to do some technological Spring cleaning - primarily in Outlook. Currently I use Outlook to send and receive emails (2 accounts), read RSS feeds (currently 40), send and receive NNTP posts (currently 12 newsgroups) with the add-on assistance of NewsHound, maintain my contacts, maintain tasks, and maintain my calendar. And although I go through them daily, I had an issue with follow through. I would leave emails in my inbox, let tasks pile up and allow posts and RSS feeds to go unread. Last weekend I started my cleanup process. Tonight my inbox is empty and now says, "There are no items to show in this view." This in and of itself is a huge accomplishment. Now I have little over a dozen RSS feeds I flagged for interest to read, and a handful of tasks to complete.
Oh, if you ever get the urge to do this; be sure you compact your PST file afterwards. You can delete all you want out of Outlook but it's not until you compact your PST file will any of it make a difference in it's file size. According to Microsoft, "The compacting process does not remove all the free space from the file. It leaves either 16 kilobytes (KB) or 4 percent (%) of the file size (before compacting) whichever is greater." Now with that said, your Outlook 2007 PST file is created and encoded in Unicode format by default. It allows a user-definable maximum file size up to 33TB that exceeds the previous limit of 2GB. So why worry about your PST file size? There is really no reason to. I just don't like unnecessary space being used up.