Started using Windows 7 RC x64 on my main computer yesterday, so far I have only found one annoyance the following message is displayed each and every time I login to the computer:
"There is no email program associated to perform the requested action. Please install an email program or, if one is already installed, create and association in the Default Programs control panel."
This has been popping up from when I first installed my computer, before Mozilla ThunderBird was installed and set as the default mail client. The window itself is created by WMDHost.exe (a 32-bit process) part of Windows Mobile Device Center - required for interaction with my PDA.
I have tried setting the default client in control panel, this appears to work - however the message is still displayed at each and every login.