If you check the "Save Credentials" and "Automount at Sign In" on the FolderGrid WinMount "Sign In" tab then the next time WinMount is launched it will automatically sign in using those same credentials and mount your domain content using the same Windows drive letter. However, this does NOT automatically launch WinMount when you reboot or login to Windows - to do that you'd want to follow these instructions for making WinMount a "Startup" application in Windows.