Kym, if you don't want to set up your own Exchange server then using Google Apps to share mail and calendars isn't a bad idea... as long as what you're doing isn't super-secret. If you have important proprietary business secrets, I wouldn't store them "in the cloud." Also, keep in mind that you should always have a backup plan in case services like this go down. It has happened before. Just a few months ago GMail went down for a day and tons of people were in a panic. I'll talk more about this in the tutorial.