Microsoft Exchange Server 2007 includes several improvements to the suite of anti-spam and antivirus features that was introduced in Exchange Server 2003.

The following anti-spam and antivirus features are new or improved:
– connection filtering,
– content filtering,
– spam quarantine,
– recipient filtering,
– sender ID,
– sender reputation,
– IP reputation service,
– aggregation of Outlook junk e-mail filter lists.