I have Office 2000 Professional installed on my Windows XP system. I just purchased the Office XP Standard Upgrade. I do plan on un-installing Office 2000 before installing the Office XP Upgrade Software. Before doing this I have a couple of questions. 1) When saving files in Office XP, will anyone using Offices 2000 or 97 be able to read or write to these files (Word, Excel, Outlook, or Power-Point)? 2) When I save my Exported Backup.pst file using Outlook 2000 will I be able to Import it back into Outlook XP? If there are any other issues I might have forgotten or work around I might need, please let me know.