Yammer App for Android
'Stay connected to your business wherever you go with Yammer for Android.
Yammer is a private, secure social network for your company. No matter what type of business you're in, Yammer lets you connect with your coworkers to collaborate, share ideas, and be more productive.
This application offers on-the-go access to real-time conversations happening inside your organization. View messages, post updates, and receive important notifications no matter where you are, because the conversation doesn’t end when you leave the office.'
This is a free app