Google 2011, "The Globe and Mail" reported that Google bid $900 million for 6000 Nortel Networks patents. On August 15, 2011, Google made its largest-ever acquisition to date when it announced that it would acquire Motorola Mobility for $12.5 billion subject to approval from regulators in the United States and Europe. In a post on Google's blog, Google Chief Executive and co-founder Larry Page revealed that the acquisition was a strategic move to strengthen Google's patent portfolio. The company's Android operating system has come under fire in an industry-wide patent battle, as Apple and Microsoft have sued Android device makers such
Google Talk in April 2011 for the Google Nexus S. However, given that Google Talk provides XMPP protocol, most mobile phones for which a suitable XMPP client exists could also offer Google Talk service, at least theoretically (depending on the handset, the user may encounter security warnings because of unsigned Java ME MIDlets or limits put in place by the mobile service provider). Mobile clients specially designed for Google Talk exist as well. Most phones support the IMPS protocol, and there are hybrid XMPP/IMPS networks (through XMPP transports, or specially designed hybrid servers), which can also contact Google Talk users. The Google