Google has recently announced the acquisition of Postini - A company that offers security and corporate compliance solutions for email, IM and other online based communications.
Postini serves over 35,000 businesses and 10 million users worldwide.
Google has explained the deal will allow them to offer more hosted services to businesses. At the moment, 1,000 small businesses sign up for google Apps (Which includes Google Mail, Calendar, Talk etc.) on a daily basis. While Google launched Google Apps to help businesses to communicate and share information, larger companies have been unable to use it due to breach of legal and compliance issues.
Google has said that they want to address these information security and compliance issues - hence the reason for the acquisition of Postini.