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It's been a busy week for Yahoo. First, Verizon signed an acquisition deal for the internet pioneer. Then on Wednesday, Yahoo's upgraded messenger app launched for Windows and Mac desktops.

The desktop version of the app, which first made it to mobile devices in December, brings new features designed to streamline sharing and interaction with friends. Features of the upgraded platform include the ability to "unsend" messages when you hit enter a bit too hastily, drag-and-drop image sharing and the ability to search for animated .gifs to include in your messages.

The messaging market, once an easy win for Yahoo, has shifted dramatically over the past few years. Texting and apps that enable instant conversations such as Whatsapp, Snapchat, Instagram and Facebook Messenger have skyrocketed in popularity, leaving standbys like Yahoo Messenger to struggle.

If you were still using the old Yahoo Messenger desktop app, it's time to upgrade. The legacy service will shut down on August 5.