Google Inc. is sprucing up its corporate e-mail service by adding new security tools and more than doubling the storage capacity of e-mailboxes, underscoring the online search leader's ambition to enlarge its role in the business software market.

By Michael Liedtke Associated Press SAN FRANCISCO -- Google Inc. is buying e-mail security specialist Postini Inc.

Google Inc. is buying e-mail security specialist Postini Inc. for $625 million, fortifying the Internet search leader's effort to sell online software services to corporate customers seeking alternatives to Microsoft Corp.'s long-dominant products.

SAN CARLOS, Calif., Feb. 22 /PRNewswire/ -- Postini, Inc. the global leader in on-demand communications security and compliance solutions for email, instant messaging and the web, today announced that it has joined the Google Enterprise Professional(TM) program.

Spam growth may have showed signs of tailing off this year, but it's returned with a vengeance these last two months, and is now 90% of all email, according to one antispam company.