New submitter earthwormgaz writes "I've started at a small company and our phone system is crusty, old, and awful. We've got email hosted elsewhere on POP/IMAP, and we've got no groupware. The server here is Windows small business whatever-it-is and Exchange isn't set up, but I've put CentOS on it in a VM, and I'd like to do everything using open standards and open source where possible. I've been looking at SOGO, and these phones. What are my chances of getting all this stuff working together? What other suggestions have people got a for a small office and communications?"