WebOffice brings together powerful, professional web-based business applications specifically designed to make collaboration easy and cost-effective. Everything you need to manage your business on the web is together in an integrated, centralized place.
WebOffice is good fit for organizations below 100 employees and cost less than $150 per year per user.
Some of the features of WebEx are online emails, calander, event oraganizer, and announcements.
Google Apps are also providing almost same service.
Check out WebOffice here: