That was the case but it seems that Microsoft has relented. I have just read that they will continue to issue Vista security updates for another 5 years from April this year provided the latest service pack is installed. Sigh of relief. Support is due to end on Apr 11th 2017. Enhancements and bug fixes are not included for consumer editions.
Honor 5X review: Hands-on with the new budget phone from Hauwei's young brand