Microsoft provides documentation on setting up Lync and Exchange with Office 365. Here is some technical documentation on the process. It is possible to use Office 365, with Exchange 2010 and Exchange 2013. Set up of Exchange 2010 integration is also supported. This requires setting up some external records in the public DNS, followed with a download and a few power shell commands to make the Active Directory environment federate to Office 365. The TechNet Blog can provide enough Information to set up the basics. Refer to the Microsoft Exchange Server Deployment Assistant for steps on the integration of Office 365 and Exchange.
This article does not go into detail about the setup and Deployment of Office 365. This is meant as an informative document the share links that may allow you to set the Office 365, On-Premise, or Off-Premise, environment up on your own. For additional information, including a video and the link to purchasing licenses, refer to Dell Community Article: Introducing Microsoft® Office 365 with Dell.
The Office 365 integration is a complex setup. However, deployment is also available from Dell.
Review the following links to become familiar with the processes you need to understand when using the product:
Office 365 Lync integration articles:
Informational articles: Regarding presence issue:
Information articles:
Video that can be shared with users: