Microsoft is planning to include Visual Voicemail in Windows Phone 7.5, according to one anonymous leakster.
The suggestion comes from the Twitter account @WindowsPhone8. The account has previously announced Mango developer features shortly before Microsoft’s official MIX11 conference in April.

Visual Voicemail in Windows Phone 7.5?
Visual Voicemail is currently available natively on Apple’s iPhone devices and through third-party applications on Google’s Android devices. The feature allows users to listen to voicemails without having to dial a special voicemail service. Visual Voicemail is particularly useful for seeing who has left you messages and being able to rewind or fast forward them easily.
Microsoft is currently hard at work on “Mango”, its next major release of Windows Phone. Microsoft has promised to ship “Mango” later in the year. “Mango” is currently in the early beta stages at Microsoft, built as 7.1 currently. The company revealed a number of new features in February that will ship as part of its Windows Phone point release later this year. Nokia is also reportedly waiting for the next release of Windows Phone before it unveils its first Windows Phone device.
“Mango” currently contains multitasking, Internet Explorer 9 mobile and Twitter integration. Microsoft unveiled a number of key developer enhancements at its MIX11 conference earlier this month. Developers will have access to the Motion Sensor library and the camera, enabling augmented reality experiences. Phone integration has also been greatly improved for developers wanting to do more with their apps. The Live Tiles functionality has been expanded to give developers more flexibility and engage with their customers better.
Microsoft is expected to reveal a number of key features for Windows Phone 7.5 at a special preview event on May 24.