Google Apps for Business

Google Apps is a cloud-based productivity suite that helps you and your team connect and get work done from anywhere on any device. It's simple to setup, use and manage, allowing you to focus on what matters. Powerful search lets you find everything, and labels and filters help you stay organized. The cost is $5/user/month or $50/user/year for custom email addresses at your domain and 30GB of storage shared across Google Apps with the option to purchase more so you never have to delete anything.