Google is moving to attract big business users, as the company said on Tuesday it is offering stepped up e-mail management services at no additional cost to paying users. Google is introducing e-mail controls and anti-spam protections resulting from the acquisition of e-mail services supplier Postini, which it closed three weeks ago.

Enterprises which pay $50 a year per office worker for the Google Apps package of business software, e-mail and Web services will get 25 gigabytes of data storage each for no extra cost, meaning many users will no longer need to delete incoming e-mail.

The move offers 50 to 100 times more than most users of rival e-mail systems such as Microsoft Outlook or IBM Lotus Notes are typically allotted by their organizations. Because Google delivers e-mail as a Web service, it can deliver storage at lower cost than traditional e-mail installations.

Google Apps had initially targeted a free version of its Web-based software at small businesses and educational institutions worldwide. But its latest moves highlight the company's increasing ability to meet the security and central management software requirements of big businesses.

In another step to entice corporate users away from established business software providers, Google said it could now route e-mail from other e-mail systems alongside Google's own e-mail services. That removes a major inhibitor to businesses that can't move employees to Google Apps at once.