Windows Phone users are excited about the launch of 8Marketplace, an unofficial app store, and the introduction of Vianigram, a native Telegram client developed by a user named LegitimatePost2701. Vianigram is built on the MTProto protocol and offers features such as comprehensive login options, real-time chats, a chat list with pagination, typing indicators, rich text formatting, voice messages, background synchronization, and locally generated notifications. However, it is still a work in progress, with some drawbacks like delayed notifications and a need for UI improvements. Users can find the app by searching for the Telegram channels PivoraApps or VianiumApps.