http://www.makinglifeezy.com.au/page/au/contact-us.html
We are talking to these people at the moment. It started with Mac, runs on File Maker and for multi user you just buy FileMaker Server. The only problem it has is that you need to be on line to see the info. I have said that you need to be able to trap the info on yr laptop and or mobile as you are not always on line, esp. when travelling like we do. Comments if you can be bothered please.
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Simon
http://www.bramshaw.com.au
Melbourne - Australia GMT +1100