Microsoft Office365 will launch on Tuesday 28th June 2011. The company boasts that it already has more than 100,000 customers running on the beta version.
Subscriptions for Office 365 (Plan P1) for professionals and small businesses start at £4 per user per month.
For more information please see http://en.wikipedia.org/wiki/Microsoft_Office_365 and http://arstechnica.com/microsoft/news/2011/06/microsoft-office365-will-launch-on.ars