Montalex - I was having the same difficulty in using Send to Kindle, so I started a thread in this Kindle forum. It turns out it's a simple matter of updating your root certificates. I've quoted the response below:
You should update root certificates from Microsoft website - rootsupd.exe
You can find direct link here:
http://answers.microsoft.com/en-us/w...0-5d719ec2d6de
Last edited by dimasic; 10-15-2013 at 09:41 AM.
Once I updated the certificates, Send to Kindle is working again!
Good luck!
SteveK