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I currently run Wildfire 5 as a network install with no issues. My Workstations are running Windows 7 SP1 64-bit and the Network Server is Windows Server 2008 64-bit.
I don't think WF2 is supported on Windows 7 but I could be wrong. Maybe it's the 64-bit support. WF5 64-bit runs great on Windows 7 64-bit.
"Too many people walk around like Clark Kent, because they don't realize they can Fly like Superman"