Unlimited users: Invite as many people as you need.
Discussions: Don’t ‘reply all’. Use Discussion forums to brainstorm ideas.
Document creation: Create and edit Word and Excel documents online.
Storage: Store, share and manage your files 1GB+.
Project alerts and notifications: Assign tasks, auto reminders and iCal integration.
Whiteboards: Or wiki, share ideas, comments, etc.
Document management: Automated versioning, audit trails and approval workflows.
Custom branding: Customise your dashboard, homepage, emails, own URL.
Notifications: Via dashboard, email, and RSS.
Security: 128 bit SSL, control over who can see and read documents.