Features of MS Exchange 2003:-

* MS Exchange 2003 is 32 bit
* Single server base, No roles base
* Outlook Mobile Access (or OMA)
* Active sync
* Up-To-Date Notifications

Features of MS Exchange 2003 with SP2

* MS Exchange 2003 is 32 bit
* Single server base, No roles base
* Outlook Mobile Access (or OMA)
* Active sync
* Up-To-Date Notifications
* Direct Push
* Global Address List lookup
* Mobile Admin

Features of MS Exchange 2007:-

MS Exchange 2007 has enhanced and newly added features such as:

* Has Powerfull command line i.e. Power shell for configuration
* Most of the configuration is done through power shell
* Fast message retrieval
* Follow-up flags
* Meeting attendee information
* Enhanced Exchange Search
* Windows Share Point and file share document access
* Reset PIN/Password
* Enhanced PPC security
* Auto-discover for over the air (OTA) provisioning
* Out of Office
* Support for HTML messages

Missing/Removed features in 2007 RTM due to stability Issue but available in SP1

* Information Rights Management (IRM)
* Support for S/MIME

MS Exchange 2007 has Role base Infrastructure which are as follows:

Mailbox Role:-

* Stores Mailboxes and Public folder
* Client Access request for mail are fetched by this Role
* Browser-based clients using either the full-featured Outlook Web Access (OWA) or a new OWA Light client
* Mobile devices via Exchange ActiveSync (EAS)
* Phone devices via Outlook by Phone
* POP3 or IMAP4 clients, such as Outlook Express and Eudora

Hub Transport

* Responsible for all internal mail flow. Inbound mails are accepted by Edge Transport and passed on to Mailbox server and all outbound mails are relayed from the Hub Transport to the Edge Transport and out to the Internet.

Edge Transport

* Edge Transport server handles all Internet-facing mail flow, which provides Simple Mail Transfer Protocol (SMTP) relay and smart host services for the Exchange organization.

Unified Messaging

* Unified Messaging combines email, voicemail and fax into the Exchange Server databases, and makes this data available to mailbox users via both telephone and computer.

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