WhatsApp For Windows Phone 7.5 (Mango)
WhatsApp has been on the Windows Marketplace for Mobile since last Saturday, but only for Windows Phone 7.5 Mango users. Most of us are still on Windows Phone 7.0, eagerly awaiting the 7.5 upgrade.
mango
Windows Phone 7.5 Mango, from the preview and RTM to messaging support.
Windows Phone Mango RTM
Windows Phone Mango, also known as Windows Phone 7.5, has reached Released to Manufacturing, meaning we'll have it soon, likely around September or October 2011. The RTM build is 7720, and the Windows Phone development team officially signed off.
Microsoft Previews Windows Phone “Mango” Update
Microsoft has previewed its Windows Phone 'Mango' update, with the Windows Phone 7.1 SDK now out. Mango and new Windows Phones are due this autumn, the first Nokia Windows Phones will run Mango, and Communications gains Threads and Groups.