I recently purchased a new computer and the store told me that the office 2003 that I had would not work on vista. I purchased what I thought was office professional, but the box says upgrade. I did not have office on the new computer and the install worked fine. I thought I was buying the regular office professional, I did not notice nor was I told that it was an upgrade and I thought I had to have had a previous version installed onthe computer. My question now is can I install this same software on both my new desktop and my new laptop, or do I have to buy another copy of office.