I'm using Windows 8, have McAfee Virus Scanner and Mozilla Thunderbird installed.
When I start Thunderbird, the CPU consumption of the on-demand scanner process goes up and thunderbird becomes non-responsive (no-response).
I have to kill Thunderbird to resolve it.
When I disable the McAfee on access scanner, I can use Thunderbird normally.
I also use Windows 7 on another machine, there McAfee and Thunderbird work well together.
Any help is greatly appreciated.