Google is extending its hosted email archiving service to hold messages for up to a decade.

Google Message Discovery, which lets users search archived email, debuted in April and supports Microsoft's Exchange and IBM's Lotus Domino email systems. The company priced the service at $25 per user per year in the US, which includes Google's Postini antispam and antivirus filtering.

Google will now hold email for up to 10 years for $45 per user per year including the email security service. It will still offer Message Discovery at $25 for archiving email for a year or less, according to the company's enterprise blog.

In the UK, one year or less of archiving will be £12.50 or £22.50 for up to 10 years.

Google claims that companies would spend $200 per user per year for on-premise security and archiving software and hardware.

Businesses are increasingly adopting email archiving software in order to comply with government regulations and legal challenges.