Main Features in Yahoo! Messenger 11 Beta:
Chat with Facebook friends
Play Games Inside Yahoo Client
Update your status on Yahoo, Facebook and Twitter
Yahoo Messenger for Android with voice chat and photo sharing
Stay Signed in on Multiple PCs
Conversation history available from any PC

What’s new in Yahoo! Messenger 11 Beta?

• Keep up with friends wherever they are – View, comment on and like updates from Yahoo! Pulse, Flickr, Facebook, Twitter, and more, all from one place, right within Yahoo! Messenger.
• Post one status to multiple social networks – Share your Messenger status simultaneously on Yahoo! Pulse, Facebook, and Twitter.
• Chat with Facebook friends – In addition to your friends on Windows Live, you can now IM your Facebook friends right within Yahoo! Messenger.

Yahoo! Messenger keeps you connected whether on desktop, the Web, or mobile devices.

• Enjoy rich experiences across devices – Now on Android! – Make free video calls, and share photos and videos between PC, iPhone, and now Android.
• Converse virtually anywhere – Start your IM conversations on your PC and continue them from your iPhone, Android, or any Internet-enabled device.
• Always be available – Stay signed in to multiple PCs simultaneously so you never miss a message.
• Easy access to recent conversations – Retrieve recent IM conversations from any PC where you have signed in to Yahoo! Messenger.

Full Offline Installer:
Direct Download Yahoo! Messenger 11 Beta Offline Installer

Mirror Link:
Direct Download Yahoo! Messenger 11 Beta Offline Installer

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Update: Yahoo! Messenger 11 Final is out already, you might check that out for Full Offline Installer direct download link from yahoo server. Thank you.