I don't sell Linux servers or anything like that, I'm just curious, what stops you from using Linux?
As a server, nothing should stop you as it performs way better than Windows. But, on the desktop, what's stopping you?
I use Linux (Ubuntu Studio) for my business and soon for recording music. It's wonderful. It's prettier than Windows and far more stable. But it doesn't run Pastel Invoicing (those bastards) so I still need to keep Windows around.
What's stopping you?