Google data centers in late 2013 and began selling off the barges in 2014. Most of the software stack that Google uses on their servers was developed in-house. According to a well-known Google employee, C++, Java, Python and (more recently) Go are favored over other programming languages. For example, the back end of Gmail is written in Java and the back end of Google Search is written in C++. Google has acknowledged that Python has played an important role from the beginning, and that it continues to do so as the system grows and evolves. The software that runs the Google infrastructure includes:
Yahoo! Mail online post asking Yahoo to bring back mail tabs with one hundred thousand voting and nearly ten thousand commenting. The redesign produced a problem that caused an unknown number of users to lose access to their accounts for several weeks. In December 2013, Yahoo Mail suffered a major outage where approximately one million users, one percent of the site's total users, could not access their emails for several days. Mayer publicly apologized to the site's users. Yahoo! Mail China officially announced its shutdown on April 18, 2013. Users were warned that all emails, contacts, and account settings would be inaccessible,