Salesforce Requirements
Salesforce Professional, Group, Enterprise, Unlimited and Developer editions are supported with a Salesforce Security token. You can generate a security token by logging into Salesforce and click on your name in the upper right. Choose setup then select reset my security token under personal information on the left.

Exchange Requirements
Microsoft Exchange Server 2007 SP1 or later is required. We support Hosted Exchange services such as Microsoft Office 365, Rackspace, Mailstreet and others.