Hi there,
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However after installing the latest Intel Bluetooth drivers from Intel website (17.0.1405.02, win7 x64), it is working great just as in Windows 8/8.1 as it should be!
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Hope my experience could help the rest of you who is still hesitant to it.
We run EliteBook G3 laptops on Windows 7 64 bit, (work PC), and there is no Low Energy BT Driver as standard.
Was considering a Nano USB from Maplin, but I wanted the additional USB port the current mouse was using, so came here.
This (above) worked a charm.
https://downloadcenter.intel.com/download/26946/Intel-Wireless-Bluetooth-for-Windows-7-
Installed drivers (I'm a local Admin)
Rebooted
Surface mouse found instantly, and device drivers loaded (standard HID drivers).
THANK YOU !!