I've come across plenty of how-to's for this that deal with Linux (and back in 2010 when not all tools were available on the EC2 web interface) but none that deal with Windows (that work). I've tried Converting EC2 instance from instance-store root device to EBS root device but was unsuccessful - the machine doesn't power on.
Has anyone been able to successfully convert an Instance backed Windows AMI to EBS backed successfully using the web console? Or do you still need to utilize the EC2 CLI tools?