The system requirements page for FileMaker Pro has never included Windows 7 Enterprise.
Yet for FMP versions 11 through 15, Windows 7 Ultimate has always been included.
From my research, Windows 7 Ultimate is said to be the same technology as Enterprise, just named differently because Ultimate was marketed to "PC enthusiasts" while Enterprise was for volume license customers.
Is that why FileMaker tests it products only on Ultimate, but not on Enterprise -- because it would be redundant?
My university's health system runs on Windows 7 Enterprise -- thousands of machines. I want to be confident that FMP will run safely, yet I can't get that assurance from FileMaker, or even a statement that their testing on Win7 Ultimate can be considered "sufficient" for Win7 Enterprise customers.
And my guess is that the Win7 Enterprise user base far exceeds that of Ultimate, although I can't find figures to prove it. Volume license customers are typically large institutions like mine, where IT departments prefer the safety of staying on older, Enterprise versions of Windows for a long time.
And no, of course I can't ask our IT staff to change their mandated Windows version here to suit FileMaker's requirements. So:
FMI is only going to support the version that they have tested and place on the compatibility list. It does not mean it will not run on the OS. It's just not supported or guaranteed.
You can download a trial version to test. It is the full version of FMP, it will only work for 30 days.