Installing Lotus Foundations start is quite a simple thing following this guide. You end up with a VM holding a basic Foundations installation.
Webmail and calendaring (Domino Web Access) is already included and ready to use. You can choose between Full and Light version of DWA.
The web interface provides and easy way to manage and monitor your Foundations installation. There are functions to add users, to install AddOns, to configure mailing, ports and other stuff. Adding a new user automatically creates a new mailfile for this user so that she/he can immediately start over with writing mails and creating calendar entries.
There are a couple of AddOns you can install to enhance the capabilities of the server. Lotus Domino, Lotus Notes, Lotus Symphony and Engate Mail Sentinel (Anti-Spam). All AddOns will be installed to the Foundations server and managed from there. The Domino Server runs on the Foundations server. Lotus Notes and Lotus Symphony however are installation packaged which can be downloaded to workstations and installed there. Both Lotes and Lotus Domino are currently version 8.0.1!
Altogether the installation and configuration of the server is very easy, AddOns install themselves with no additional settings to be made and it simply works! Now all sales people have to convince S and M customers to buy this server. I have no clue how to licence the server and the AddOns and how much a licence costs, but given the simplicity of installing and configuring the server and yet the power of tools it provides it should sell well.