Shrink your mailbox with a PST fileThese tips can improve the performance of Outlook 2007 Beta.
Read Joshua's article for more troubleshooting tips.
Joshua's first suggestion: Reduce the size of your mailbox with a PST file. To create a new offline folder for Outlook (PST file): Click File | New | Outlook Data File. You can now archive messages to the PST file, which prevents Outlook from automatically loading. You can access your PST when you want to read the archived messages. If you have a large mailbox, this tip will increase the speed of nearly any Outlook version.