mail server comparison

		1. Zimbra Collaboration Suite	2. Mdaemon (+Security Plus)	3. Exchange 2007
	E-MAIL FEATURES
	Server OS support
	Linux/Unix	x	-	-
	Windows	-	x	x
	Mac OS X	x	-	-
	Storage
	Database	x	-	-
	Filesystem	x	x	x
	Clustering	High-Availability	-	x configuration + data replication
	Other	-	-	-
	Login
	SMTP Auth	x	x	x
	POP before SMTP	-	x	-
	APOP	-	x	-
	Authentication
	Filesystem	x	x	x
	Database	-	-	-
	LDAP	x	x	x AD
	Other	kerberos, custom auth	-	-
	Spam Protection
	SpamAssassin Heuristic Analysis	x	x	-
	Baysian Filtering	-	x	-
	Integrated Spam / Junk Folders	x	x	x
	Content Filtering	-	x	x
	SPF (Sender Policy Framework)	-	x	x
	External Blacklists	-	x	x
	Challenge-Response System	-	using Zaep plugin	-
	HTML Filtering	-	x	Safe HTML feature in OWA
	RBL and Content Filter Bypass Files	-	x	x
	Personalized White and Black Lists	-	x	x
	End User Control to "Mark as Spam"	x	in web client	x
	Security
	Antivirus Protection Support	x	x	x
	Authentication Support	x	x	x
	Mailbox Restrictions	x	x	x
	Auto Archive / Backup	-	x	x
	TLS / SSL Support	x	x	x
	System and Domain Administrators	x	x	x
	External Antivirus Product Support	-	-	x
	Remote Server Monitoring	x	-	x
	Static Filter	x	x	x
	Integrated Antivirus	x	x	attachment filtering
	Scalability
	Backup	x	x	x
	Auto responder	x	x	x
	User mail filters	x	x	x
	Multiple Domain Support	x	x	x
	WebMail	x	x	x
	Remote Account Mail Retrieval / Domain POP	-	x	with 3rd party POP collector
	IMAP - Shared Folders	x	x	x
	Global Address Book	x	LDAP	x
	Mailing List / List Server	administrator	x	x
	LDAP Support	x	x	x
	API DLL Support	-	-	x
	IMAP – Rules	-	x	x
	Content Filter XML Export/Import	-	x	x
	Catalog Support	x	x	x
	Multiple CPU	x	x	x
	WebMail HTML Editor	x	x	x
	Active Directory / Apple Open Directory Support	x	x	x
	News Server (NNTP)	x	-	x
	Support for 3rd party applications/filters	zimlets, admin custom modules	x	x
	COLLABORATION FEATURES
	Instant messaging
	Instant Messaging / Chat Server	x	x	x
	Groupware (Contacts, Calendar and Tasks)
	Individual calendar	x	x	x
	Shared calendar	x	x	x
	E-mail reminders	x	x	x
	Recurring events	x	x	x
	Calendar publishing	x	x	x
	User contact folders	x	x	x
	Shared contact folders	x	x	x