Microsoft Exchange Server 2007 Comparison

Microsoft Exchange Server 2007 still has the usual 2 versions of the server product, but it now also comes with two versions of CALs, Std and Enterprise. Here I hope to highlight the main differences between the 2 servers editions and also explain why there are more CALs, how they differ and when you’ll need them.

Exchange Server 2007 comes in both Standard and Enterprise versions, as did previous versions of the product. Standard is aimed at the small to medium business while Enterprise is for the larger companies that need the increased functionality.

Exchange Server 2007 Edition Offerings


Standard Edition

Enterprise Edition

Storage Group Support

5 storage groups

50 storage groups

Database Support

5 databases

50 databases

Database Storage Limit

16 TB per database

16 TB per database

Single Copy Clusters

Not supported


Local Continuous Replication



Cluster Continuous Replication

Not supported


Standby Continuous Replication ***



***Offered via Service Pack 1

As you can see, the Enterprise Edition is aimed at the higher end companies who have many thousands of users and/or require high levels of redundancy via the clustering options.

The CALs also come in Standard and Enteprise Editions, but they can be used with either server version so you can have Std Server with Enterprise CALs, an Enterprise Server with Standard CALs or a mixture of the two.

The Standard CAL(surprisingly!) offers the standard functionality you’d expect from Microsoft Exchange- access to email, shared calendars and Outlook Web Access (OWA).

The Enterprise CAL is an additive meaning it must sit on top of an already purchased Standard CAL. The Enterprise CAL offers extra features including Unified Communications and ForeFront Security. A full comparison can be found here.

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