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Not to praise Microsoft, or bash Apple, I just want to say that I run a digital imaging business (we make large prints for trade shows and exhibits) and relay some experiences. 1. We use Macs to open any customer files prepared by our customers on their Mac's. Most of the files (75%+) are from artists working on Mac's) 2. Some of the technicians here really do prefer to work on Mac's. 3. The biggest problems we have with the Mac's other than crashing daily is a) they are terribly slow on the network, and b) writing large postscript files from Adobe Illustrator is painfully slow. We frequently re-open the AI files on an NT Pc to prepare the postscript. 4. The NT Workstation machines almost never crash. When they do, it's usually because disk space has run short. Lot's of temp files left around can bring them down. 5. I can't remember the last time an NT RIP crashed. We run diskeeper on them nightly to reduce fragmentation, keep on eye on the disk space, and shut them down ...
A very useful tool for people who need to work with very large files is a program called Wright Design. It runs only on Windows machines, but it works really well. The interface is decidedly different than Photoshop, and takes some getting use to. Definately work through the tutorial. I've used the program for a few years, and it has saved me hundreds of hours. You can download a demo (free) from this site: http://www.wrightna.com