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

In addition to the existing database support, please add support for SQLite databases, without a LINQ layer like for SQLCE. Just a raw database with SQL commands like we are used to. SQLite is platform independent, that means it is easy to exchange data between Windows, Windows Phone, Android and iOS devices.

There is no way to modify the first WL account in WP7....XD
1. If I lend my new WP7 to my parent before WL registration, my parent's people will be keeping in this device. That is not important for me.
2. If my WP device installed many apps lent my wife, she can't switch my WL account to her WL account.

Can We Have shared Isolate File so that all the application in the device can share the Global Data.Instead of keeping the same data in each isolated storage file for each app.This Feature may reduce replication of data.

A developer should be able to grant access to another app for data access. So if an app does contacts then another app could query the contact data instead of providing it's own mechanism for contacts.

I want to have a chooser that pops up, and discloses all information about a particular contact like Home Number, Mobile Number, Email Address, Name, Display Name, Photo. 3rd party integrated stuff like facebook etc. would also be good. But right now I sincerely feel that we need a generic chooser rather than a chooser for every specific detail.

Currently for dynamic data binding controlls like listbox, <a href="http://msdn.microsoft.com/en-us/library/ms668604%28v=vs.95%29.aspx">ObservableCollection</a> is recommended. However the collection does not implement Sort, and it does even implement Move (so you can implement sorting on your own by extending it). Can we have a sortable observable collection for WP7?

SQLCE for WP7 should allow us to assign explicitely a value to Identity fields marked as IsDbGenerated fields. Currently SQL Server allows it throw this command. SET IDENTITY_INSERT dbo.TableName ON

It would be great SQLCE for WP7 allows us to set this option using attributes of the Table/Class. In fact other multiplatform databases that work for WP7 as Siaqodb include this and even other features SQLCE for WP7 still not.

A lot of programs provide navigation and GPS maps.
Some of them allows user to store "Favorites".
But they did not integrate each other: If I save POI in one program it will not be shown in other.
I suggests to add some kind of Storage to store GPS POI.
In addition this storage may have integration with contacts to allow user have geographical map of his contacts.

Currently all data is lost when uninstalling but it would be nice if Zune kept it and put it back when re-installing. That way if my phone gets too full, I can remove a large app e.g. a roleplay game with lots of hours of playtime and then when I have space, reload it and resume where I left off. This annoys the heck out of me on the iPhone so I would love it if we could do better!

Please allow us to dial security code from third party apps. To make it safe, you can notify the user if the application uses security code at the time of installation.

fetching the sip call history is useful to the user to see the sip call detailscall

A media picker control that you could activate that would let the user go through their media library and check off a list of songs or videos. This would also be very nice so that you could add a 'create playlist' feature into the music+video hub.