Depends what Yahoo! bought Zimbra for, really. You may have noticed that Yahoo! has quite a big internal mail platform... perhaps they actually wanted the tech

Depends what Yahoo! bought Zimbra for, really. You may have noticed that Yahoo! has quite a big internal mail platform... perhaps they actually wanted the technology expertise and the people more than the enterprise business. Perhaps they already extracted that value. Disclaimer: I work for Y! but not for mail and I have no insight into mail at all. Also these opinions are my own and not Y!'s.