There was already a statement that Windows Phone 8 devices will be upgradable to Windows 10.
I'd be surprised if they were to release an upgrade that would stop previous purchases from working following upgrade of the operating system. I'd also be surprised if there weren't still phone specific apps (like Here Drive+) whilst others may migrate to being ...
Until the SDK formally releases, deep details aren't available.
But you will not be able to directly take an executable binary from Win8 to WinPhone8.
If you're looking at doing layers that are portable between Win8 and Windows Phone, spend some time studying how to use the Portable Class Library Project in Visual Studio 2012. Key piece of portable. Here's ...
Until Microsoft publicly releases details on how to write applications for Windows Phone 8, there can only be speculation; What is known is that there are some differences between Windows Store style applications, and Windows Phone Apps, that mean developers will have to download additional tools to target Windows Phone devices.
It has been said that the ...
It depends on the complexity of the application, but if you are writing a "Metro UI" application on Windows 8 then porting may be relatively easy:
If you have a game written in C++/DirectX or an app that works inside
an IE control, it should be easy to port to Windows Phone 8. For
everybody else going from Windows 8 to Windows Phone 8, you've got a
In the phone
Check that the date and time of the phone are correct.
Select Settings> Date / Time & Language> Date & Time
(Lumia with Windows Phone 8: Settings> Date & Time).
Set Set date and time automatically to Off and manually set the
current date, time, and time zone.
Go to the Store and check if there are any unsuccessful download apps or ...
Firstly, this is off-topic here. But to answer your question, your WP 7.5 app can run fine on WP7.5 and WP8, but you wont be able to use new development features of WP 8.0/8.1.
But I would recommend you to look at developing seperate apps seperately. If you do follow MVVM pattern, you just need to change the View part ie. the UI code. Rest all of the code ...