Following on from Sarah's post, here are some additional pieces to help you navigate the world of Office 365
Activate Your Internal Usage Rights
If you haven't signed up for Cloud Essentials or Cloud Accelerate to get your 250 internal user right subscription for the E3 plan. What's the E3 plan?
Office Professional Plus Lync OnlineSharePoint OnlineExchange OnlineOffice Web Applications
Signing up is easy, and there are other benefits along with these 250 licenses, so explore the Microsoft Cloud Partner site to find out more.
Learn About It
There are already quite a few good sources of information, these are just a few to get you started.
QuickStart Online ServicesOffice 365 Youtube ChannelTechNet Office Professional Plus for Office 365Microsoft Press Books
Thinking about moving some of your users or systems over to Office 365 and don't know where to start? Leave a comment and we will make sure more of the appropriate resources come your way.