Do I need to install anything on my SharePoint or Exchange Server?
Is this is a client only installation or do i need anything on the server?
James Fox commented
There is no installation on your Microsoft Exchange Server. OnePlaceMail is client installation (an Add-in for Microsoft Outlook) and connects from Outlook to your SharePoint environment.
SharePoint 2010 or Office 365
There is no installation on the SharePoint server. You simply install the OnePlaceMail client software.
A OnePlaceMail Server Component is required if you are saving to SharePoint 2007.