I have been using ACT! Version 6 for the past 4 years on my desktop computer running windows XP. Recently I have been receiving the message 'An unknown error has caused ACT! to shut down. You will loose any unsaved data' everytime I exit ACT after inserting new contacts into my database or changing menu drop down options, or changing anything that does not save automatically before I exit. Having searched other error message results on the net I see that several people recommend updating to a newer version of ACT, but ACT version 6 is the only one where I can generate and edit html emails to the individual entries in my database. The downside is that ACT version 6 is not compatible with windows Vista so I will inevidently have to change at some point in the future.