Give your business a highly secure, central location where employees can collaborate with team members efficiently, find organisational resources, manage content and workflow and gain the business insight to make well-informed decisions. Employees can create and manage custom team- and project-focused intranet sites for collaboration and document sharing.
There are certain differences between Sharepoint Online and MOSS 2007 which can be seen here.
Pricing:
Sharepoint Online costs £4.85 per user per month so £58.20 per user per year. Since the November 2009 price cuts, it is now:
£3.51 per user per month, so £42.12 per user per year 
Download datsheet here and sign up for a free 30 day trial here.
