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I do not have Vista, but I noticed that Nokia devices have several USB modes, i.e. Windows recognises the Nokia device depending on the selected mode differently. If you choose media transfer or data transfer (the different phone models seems to have their individual naming for the modes), then you nee to use that "safely remove hardware", because windows recognises the Nokia device mass storage or Windows Media transfer device (not checking right terms here).
But, when you connect with "default"/"nokia"/"PC Suite" mode, you don't need to use that, because the mode PC Suite uses is wireless mobile communication device class (WMCDC) which builds up and ends the connection session differently.
And NSU uses yet another mode and that is why PC Suite "disconnects" and NSU "connects" and then back.
Nothing has changed from 6.84 -> 6.85, but OK, as said I don't have Vista...
And I recommend 6.85, nice new features again, drag and drop particularly
Also had to return from 6.85 to 6.84 to allow NSU to update N95 to v20 after wasting time downloading 114.9Mb twice and then finding "installation failed". I then found that if you monitor taskbar the PC Suite icon turned red after about 35 minutes with approximately 70 Mb downloaded on 2Meg. broadband connection, which meant application can't find phone at the end of the firmware download. I don't whether application is now timing out, so that with faster broadband connection there would be no problems.
Happy to have helped forum in a small way with a Support Ratio = 37.0