Is it possible to upgrade a recent project that I started developping with windows phone 8 sdk and continue it with windows phone 8.1 or do I have to restart from scratch
If you want to target Windows Phone 8.1 (Silverlight Application) then you don't need to start from scratch, you will be able to upgrade from your Windows Phone 8 (Silverlight Project) but if you want to target Windows Phone 8.1 (New Universal App API's) then you will have to develop your application from scratch.
Here this will help you understand better Link
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My old Dell laptop os is vista.
Just wonder if it is possible to develop windows phone 8/8.1 app on vista?
Your comment welcome
Seems to be impossible. I've tried to develop win phone 8 on Win7, Visual Studio told me that I should update to Win8
You can't develop because it need minimum windows 8
I am a newbie for WP.My windows phone 7.1 application works in windows phone 7 but the application hangs when I open it in windows phone 8. I also want to know how to test the application for compatibility in both windows phone 7 and windows phone 8.Thanks in advance.
The applications built for Windows Phone 7.x should work on Windows Phone 8. However,some applications may not work properly and you should definitely test your application on Windows Phone 8 devices.
You could also maintain two versions of your application: one for Windows Phone 7 and one for Windows Phone 8. You will be able to upgrade Windows Phone 7 project to Windows Phone 8 project, but you cannot downgrade. The best thing to do is to create a new Windows Phone 7 project and move all files from the WP8 project to the new one.
Fore more refer this
Hope it helps!
I have developed an app for Windows Phone 8.1 but now I want the same app to developed in Windows phone 8.0. It is possible to do that? Is there any migration tool available or I need to develop from scratch.
No you can't downgrade any app after you've started developing. IF you wanted to develop a WP8 as you said have to start it from the scratch. But still you can upgrade a WP8 app to WP 8.1 (For Silverlight Apps). If it's normal WinRT app you can only develop targeting 8.1 only.
For more have a look here
Hope it helps!
You just compile the 8.0 release and upload the *:xap to the store without deleting your 8.1 *.appxupload.
Uppdate App >> Upload and describe your package(s) >> Add new
You might wanna consider making a phone 7 app for best coverage (7 will work for 8.0 users).
I am developping application using windows phone 8 sdk and I wonder if this application can work on device that use windows phone 8.1?
Yes, Windows Phone 8 app can continue to run on Windows Phone version 8.1.
But there are some compatibility and breaking changes you can check here.
I recently updated my Visual Studio 2013 such now it allows to develop Windows Phone 8.1 applications.
But now, when I create a Windows Phone project, it is systematically for WP 8.1 and I can't change the target.
The only way I found in order to develop WP 8.0 apps it's to create Silverlight Windows Phone project.
Whence my question : What's the concrete difference between Windows Phone project and Silverlight Windows Phone projet in Visual Studio 2013 ?
Thanks for any answer
The Windows Phone project uses the Windows Runtime APIs. A lot of the Windows Runtime API introduced in Windows Phone 8 project is common to both Windows Phone 8 and Windows 8, making it easier to write once and share code between your apps on both platforms.
As expected the Windows Phone Silverlight project uses the Silverlight based APIs.