Bring back categories for Outlook integration. Including Tasks, appointments and contacts

Allow developers to implement an interface(s) on a user control and "submit" that instead of just filling in a tile data structure. This will make tiles truly "live" and open up the live of WP7 to new applications. This is also completely secure because the runtime can analyze the class (and it's IL) being submitted. A bevy of restrictions can also be heaped on the said user control in order to maintain performance and not sap battery life. Let Live tiles be live, please.

Now the SMS delivery reports come in as separate text messages which is very inconvenient. Wouldn't it be nice if - when enabled - a delivery report was shown right next to the message as an icon (approval mark or something)? You would instantly know that the SMS was delivered and if you wanted further details (delivery time) you just click on it.

Extend the DeviceNetworkInformation with the MNC (Mobile Network Code) and MMC (Mobile Country Code) values. We have an application that needs this information, and we cannot get it from the current DeviceNetworkInformation.CellularMobileOperator property, because the operator name can change over time.

Access to the Light and proximity Sensors Please.

The lack of Reflection.Emit in WP7 stops developers from being able to properly test their frameworks. With no Reflection.Emit it is impossible to build a Mocking framework and actually test WP7.

The lack of Reflection.Emit is also blocking the OData Client Library for WP7.

Allow to developers create a custom keyboard. eg. choose letters and numbers together

a separate volume would be perfect as it allows to handle the volume of an app much more simply.

Add a Textbox control for the ApplicationBar like in the Internet Explorer.

Allow users to choose if they want the "call/don't call" prompt dialog when an app invokes PhoneCallTask.

Fast dialing apps are killed by this limitation.

The same way a user can grant for background tasks, he could grant the app permissions to make direct dialing.

Currently we have only access to the name and the type of an account.
If a user has defined sub calendar, we are not able to recover the name and the color of the sub-calendar.
This prevent us from creating a good display of appointment. We are not able to distinguish appointment from the different sub calendar.
For one account, we can only defined one color for ALL sub-calendar

and more generally, make W8, WP8 ... as consistent as possible

I'm developing a indoor navigation app. I Want to wp7 support get wifi strength info api.

It would be nice to have a SearchContract so the Bing Key could be more usefull. You could enter you search term and either press enter to bing for it or scroll down a list of search contract enabled applications blow the Textbox and tap the application you want to search. Of cause the nice images in the background wouldn't make that much sense anymore but the usabilty would be a lot better.

When you create a tile dynamically, it is common to want to save it as a Png file so that it uses transparency (so that it respects the theme accent color).
However, there is no built in method to save a WriteableBitmap as a png.
There is however a nice extension to save it to jpg, but that doesn't help if you want to use transparency to leverage the theme accent color in your tile.

I think many apps that need to generate a tile dynamically will encounter this issue.

For vNext it would be really great to have ApplicationData.RoamingFolder supported. It can enable some really cool and also cross-device experiences.

http://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.applicationdata.roamingfolder(v=win.10).aspx

A business feature that would be really nice to have support for it the ability to tie into a VoIP network for voip phone calls... the most common architecture is the SIP (Session Initiation Protocol). So I would like the ability to configure a SIP client that ties into our VoIP PBX and phone system.. so my WP7 would basically become my desk phone (extension). The only way this would really work well is if it ran in the background like the phone's native phone functionality.