"The real question for the company will be how to expand into
enterprises. Most open-source software companies tend to infiltrate
enterprises at the departmental level, proliferating from an
initially small beachhead. Email, however, doesn't really work this
way. Unlike an ECM or CRM system, it's tough to go off the
company's Exchange or Domino grid to dally with Open-Xchange. It's
a bit of an all-or-nothing approach."