Here we are gradually migrating away from MS stuff, but we're with having to use windows for the next few years as we need to run Access.
So client side we're using firefox, openoffice, thunderbird, qcad, jedit, the GIMP and building apps with java (which isn't free software, but is open source (just)). We've found all of them to be fantastic products, often better than the proprietary alternatives...
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Don't Stand on your head - you'll get footprints in your hair
http://charlieharvey.org.uk
http://charlieharvey.com