According to an email sent to current free Google Apps users from Clay Bavor, Director Google Apps, Google Inc (NASDAQ:GOOG) is no longer accepting new sign-ups for the free version of Google Apps. People who have already sign-up from free version would not be affected by this change. According to the company this change has no impact on current customer’s service, and people can continue to use Google Apps for free.

More than 5 million businesses use Google’s Apps, as per Google’s report earlier this year, though it did not distinguish between customers who use the free or paid versions.

Google Inc (NASDAQ:GOOG)’s this latest move will expand revenue beyond its core advertising services. Google said that businesses with 10 or fewer people will now need to pay $50 per user per year – the same rate that larger businesses pay – to use its Google Apps software which includes email, word processing, spreadsheet and presentation tools.

The change will let Google offer a more consistent service to business customers, the company said in a post on its company blog. “Businesses quickly outgrow the basic version and want things like 24/7 customer support and larger inboxes,” Google said.

This move marks the latest change to Google Apps, until 2011 it was available for free to businesses with 50 or fewer people. In June, Google launched the Google Compute Engine, which provides online computing services to a limited set of customers.

Google Inc (NASDAQ:GOOG) is the world’s No.1 Web search engine and it generates lot of its revenue from online advertising. Company does not disclose the revenue its enterprise business generates but the company anticipates that it will become an important part of Google’s overall business.

On Friday Google Inc price per share closed at $ 684.21 by dipping 1% or $6.92. Total 1.92M shares were traded.