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| Internet Protocol Security (IPSec) support for front-end and back-end clusters |  |  |
| Cross-forest Kerberos authentication with Outlook 2003 (requires Microsoft Metadirectory Services 2003 [MMS] and Outlook 2003) |  |  |
| Signed Lightweight Directory Access Protocol (LDAP) requests to Active DirectoryR directory service |  |  |
| Front-end and back-end Kerberos authentication |  |  |
| Internet Information Services (IIS) 6.0 security and dedicated application mode |  |  |
| Distribution lists restricted to authenticated users |  |  |
| Real-time Safe and Block lists |  |  |
| Inbound recipient filtering |  |  |
| Advanced junk e-mail protection (requires Outlook 2003) |  |  |
| Virus Scanning API 2.5 (requires third-party antivirus software) |  |  |
| Attachment blocking in Microsoft Office Outlook Web Access |  |  |
| Public folder permissions improvements for unknown users |  |  |
| Restricted submissions improvements |  |  |