Well we have some 1507's from vendors and I also have a job setup in Altiris where I can deploy the upgrade to 1607 (this is our deemed standard win10 inhouse version thus not going any higher on vendor pcs until we update our image which is when ltsb changes... 10years???)
anyway i have test machines of every O/S version and Flavor to test patches, software, etc... even in the TAP program so stuff not available to even the fast ring of insider preview!!!!!
and not only is MS still patching XP (deploying MS17-05-XP and MS17-06-XP Monday) but they are STILL patching 1507!
so this is just informational in case people are scrambling to get off of 1507... I think you have a bit more time.
