A complete Portal Server deployment may include integrating the portal with back-end systems. A portal is typically integrated with the following types of back-end systems:
Mail server
Calendar server
Instant messaging server
Composite application server
Content or document management server
Blog server
RSS (really simple syndication) server
Google Gadgets server
Web server
Enterprise resource planning system
Customer relationship management (CRM) system
Point of sale (POS) system
Human resources benefits system
Sales force automation system
Remote desktop system
Database system
Other portals