If anyone else comes across this problem, try this Start, settings, then phone icon, when the phone icon has been pressed you will get a box open with Phone,services, network etc along the bottom of the screen goto the furthest which is called more and see what setting you have on the Automatic pickup because if this is ticked the phone will answer incoming calls without pressing talk within 3 rings.
Have just purchased microsoft voice command for my m600 and well impressed, theres a free 5 day trial on handango web site, the windows mobile 3 version does work on this phone, although they do have a american version for windows 5 that allows you to use the programme with a blue tooth headset ( just remember though that they pronounce mobile and other words differently ) which is why i purchased the older version, i can basically start any programme on my phone by using my voice, will admit that i have had a few hiccups but it usually works fine and saves messing about with the stylus especially when you can just press one button that you assighn the programme and then just say call mark at home, 9 out of 10 from me although my Mrs reckons the voice on the programme sounds chinese