Thanks Patty,
I have been through all the documentation and have read that. After much testing I have DLO backing up PST files incremental with Outlook 2003 in the directory of my choice. With outlook 2007 PST files are ignored because DLO says they are not configured in Outlook. If I un check that setting in DLO then they are backed up completely when Outlook 2007 closes and create another copy ion the server. This is not acceptable since some users, like myself, open and close Outlook several times a day. I'm keeping 5 revisions of files and after a day or so I am now overwriting old versions which means I can not recover something deleted from a PST after a few days.
Is there something I can do to make DLO work correctly with Outlook 2007? We plan on deploying it campus wide in the spring. If DLO does not support Outlook 2007 we may need to adjust our plans.