Some features that are new in Exchange 2003 are:

* Volume Shadow Copy Service for Database Backups/Recovery

* Mailbox Recovery Center

* Recovery Storage Group

* Front-end and back-end Kerberos authentication

* Distribution lists are restricted to authenticated users

* Real-time Safe and Block lists

* Inbound recipient filtering

* Attachment blocking in Microsoft Office Outlook Web Access

* HTTP access from Outlook 2003

* cHTML browser support (i-Mode phones)

* xHTML (Wireless Application Protocol [WAP] 2.0) browser support

* Queues are centralized on a per-server basis

* Move log files and queue data using Exchange System Manager

* Multiple Mailbox Move tool

* Dynamic distribution lists

* 1,700 Exchange-specific events using Microsoft Operations Manager (requires Microsoft Operations Manager)

* Deployment and migration tools