An anonymous reader writes "Microsoft seems to have a pocketful of billions sitting around. First Skype, now Yammer – an enterprise social network service launched back in September 2008 that looks almost like Facebook minus the title bars. According to Bloomberg, the deal could reach up to a billion dollars. To date, Yammer claims 200,000 companies which include more than 400 of the 500 Fortune companies. One reason for the purchase may stem from their social-like Sharepoint platform which has been a lost cause to solutions by Salesforce.com and Oracle."