Windows phone OS 7.0 vs OS 7.1

Question

I am creating a new WP7 application on visual studio and the first thing it asks me to do is to target a WP OS version.

I have 2 options , 7.0 and 7.1 .

I am trying to make a simple app , implementing push notifications. I see on the tutorial from microsoft that is for OS 8.0 and 7.1 . What does that mean? That it wont run in OS 7.0 if i choose 7.1?

IF i develop it for 7.0 will it work at all and if yes will it run on 7.1 ?

Answer 1

7.0 is the very first version of Windows Phone 7 with no updates. 7.1 is the internal version number for Windows Phone 7.5 (codename for this was Mango).

All new phones that run Windows Phone 7 are 7.5. Most phones have an update available to update from 7.0 to 7.5.

Considering that there are very few pure 7.0 phones left, I would compile your app for 7.1 internal version, which is 7.5 external version.

Also, I am not sure even if the Windows Phone Store even accepts pure 7.0 apps anymore either.