Re: Lumia 520, 720, 920, 1020, 1320 Owners
As far as phones from 2012 and 2013 go, the support lifespan does not mean that your phone will get any new software released in that time. If your phone is guaranteed support for 36 months, that means MS will continue to release updates to make sure your phone's software (that it was released with) works for 36 months. That doesn't mean that if they create a new software they will go to the trouble of making an official version and flight it to your device.
For those of you who think that your 3 year old device not getting the next version of Windows is reason to go to Android... fine, go. But remember that many Android phones are released within MONTHS of a new version of Android, and NEVER get the upgrade. Usually only the flagships get upgrades, it's dependent on carrier, and it takes months after the version is released by Google. Most of them only get the next year's upgrade, then within 2 years of buying your flagship phone (500+ dollars) you're on an old version.