Getting Started	<<	>>

System Requirements

The following software must be installed and running on each computer that will run Microsoft Exchange Server software.

Windows NT Server version 4.0 or later and Service Pack 3.
Transport Control Protocol/Internet Protocol (TCP/IP) for Windows NT if you plan to use any Internet protocols.
Microsoft Internet Information Server (IIS) version 3.0 with Active Server pages and a Web browser if you plan to install Microsoft Outlook Web Access.
Microsoft Certificate Server if you plan to install Key Management (KM) server advanced security.
Microsoft Cluster Server software if you plan to install Microsoft Exchange Server on a pair of clustered servers.
Windows NT Services for Macintosh if you plan to install the Microsoft Mail Connector to exchange mail with MS Mail for AppleTalk Networks (also known as Quarterdeck Mail).

For improved performance, you should plan your server's hardware to meet the expected load. The hardware requirements for each computer that will be running Microsoft Exchange Server software are described in the following table. Note that Microsoft Exchange Server can take advantage of advanced hardware, such as multiprocessor computers and caching disk array controllers.

If you install Microsoft Exchange Server on a pair of clustered servers, the processors and amount of RAM must be the same on each server.

Processor Disk space RAM

Minimum

Intel® Pentium 90 MHz or faster or Digital Alpha 4/275 At least 250 MB of available disk space for Microsoft Exchange Server after Windows NT Server has been installed
Sufficient disk space for the Windows NT Server page file (50 MB plus the amount of physical RAM)
At least 24 MB

Recommended

Intel Pentium 166 MHz or faster, or Digital Alpha 5/500 Sufficient disk space for your users'
e-mail and public folder information
Multiple physical drives

At least one striped drive set

Sufficient disk space for the Windows NT Server page file (100 MB plus the amount of physical RAM)
At least 32 MB
(48 MB for RISC-based systems)

Processor	Disk space	RAM
Minimum
Intel® Pentium 90 MHz or faster or Digital Alpha 4/275	At least 250 MB of available disk space for Microsoft Exchange Server after Windows NT Server has been installed Sufficient disk space for the Windows NT Server page file (50 MB plus the amount of physical RAM)	At least 24 MB
Recommended
Intel Pentium 166 MHz or faster, or Digital Alpha 5/500	Sufficient disk space for your users' e-mail and public folder information Multiple physical drives At least one striped drive set Sufficient disk space for the Windows NT Server page file (100 MB plus the amount of physical RAM)	At least 32 MB (48 MB for RISC-based systems)

Note If you are adding a server to an existing site, verify that there is enough space on the server's hard disk to import the site's directory. To do so, verify the size of the Dir.edb file in the Exchsrvr\Dsadata directory on another server in the site.