There are 3 components you need to understand
Active Directory Synchronization: If your company has existing users in a local Active Directory environment when you subscribe to Microsoft Office 365 for enterprises, there are tools for synchronizing those users to your Office 365 directory. By using the Microsoft Online Services Directory Synchronization tool, your organization’s administrators can keep your local Active Directory continuously synchronized with Office 365. This allows you to not only create synchronized versions of each user account and group, but also allows global address list (GAL) synchronization from your local Microsoft Exchange Server environment to Microsoft Exchange Online.
Link to Microsoft: http://onlinehelp.microsoft.com/en-us/office365-enterprises/ff652543.aspx
Prepare for Single Sign on:
With single sign-on, also called identity federation, your users can access services in Microsoft Office 365 for enterprises with their existing Active Directory corporate credentials (user name and password). The setup of single sign-on requires Active Directory Federation Services (AD FS) 2.0. This article is for administrators and covers single sign-on benefits, user experiences, and requirements. It also shows you how to verify that your Active Directory setup is compatible with single sign-on requirements.
Link to Microsoft: http://onlinehelp.microsoft.com/en-us/Office365-enterprises/ff652540.aspx
This is an Outlook Add in if needed; if you use Outlook and want to combine the Meeting Request send out of Outlook and find at the same time a free room, for given date and time,
This is optional; for clients who do not want to use this feature they can directly send Invitation to attendees out of Room Manager, with no need of Outlook and Exchange: You want to see a video of this feature in RM. Click Here to see the YouTube Video: http://youtu.be/-F78CVR1RQ0