[Lilux-info] Windows2Linux migration for a Luxembourg PSF

Hi *, I'd like to know if someone here around has already implemented linux as client and server o.s. and other open software (openoffice, evolution and so on) for a Luxembourg PSF. In fact, I'd really like to slowly make my (financial and accountant) company switching from closed source to FOSS, but I'm concerned about the absence of support and professional outsourced maintenance. Do you know any IT Luxembourg company able to plan and insure maintenance of a small and quite simple IT platform? At the present we use - for ordinary work - just Microsoft Office 2007, Microsoft Exchange 2007, active directory and a tunnelled VNC from remote. Another little proprietary client-software could be at last be virtualized. In your opinion, for example, is it now possible to easily and in a "more than effective way" migrate from Microsoft Exchange to an analog free mail server (with shared calendar, tasks, appointments, requests, etc..)? I'd really like to have a feedback from you. enjoy, ;) giopas