Zoho
Free Personal
ZOHO Corporation offers online business, network, and IT infrastructure management applications, and software maintenance and support services.
Microsoft Exchange Server
Commercial
Microsoft Exchange Server is a mail server and calendaring server.
Kopano
Open Source
Kopano is an open-source groupware application suite originally based on Zarafa.
Compare MDaemon Messaging Server with alternatives
Compare Zoho and MDaemon Messaging Server and decide which is most suitable for you.
Compare Kopano and MDaemon Messaging Server and decide which is most suitable for you.
Compare Microsoft Exchange Server and MDaemon Messaging Server and decide which is most suitable for you.