
The service is IBM's effort to remake the Lotus Notes communication suite as a web-based service. Previous moves by the company have included the launch of email clients for the iPhone based on the Domino webmail system.
Microsoft is undertaking a similar transformation with its Exchange system while traditional software-as-a-service vendors such as Google and Salesforce are moving into the enterprise communications arena.
"Software delivery models such as cloud computing, software-as-a-service and hosting are evolving because companies want flexibility," said IBM messaging and collaboration vice president Kevin Cavanaugh.
"There is high demand for this approach because of the way it is delivered, and its competitive pricing."