The maximum size of a PST file for this version of Outlook is 2GB - is your PST larger than that? That is the only reason why you might need a tool to trim the size of the PST, and yes, MS do make one for that reason - it's called PST2GB, and it, er, truncates the PST file to 2GB (or whatever size you want to specify). It's not clean, it's not pretty, but it'll let you get at most of your data if your PST is too big.