Exchange server

Exchange Server 2003 is available in two versions:

Standard Edition and Enterprise Edition.

Standard Edition:

*Standard Edition supports up to two storage groups (with one of the storage groups, called the recovery storage group, being reserved for database recovery operations) and a maximum of 2 databases per storage group. Each database is limited to a maximum size of 16GB.

* Standard Edition allows a maximum database size of 75 GB, but only supports 18 GB by default

Enterprise Edition:

Enterprise Edition allows an 16 TB maximum database size, and supports up to 4 storage groups with 5 databases per storage group for a total of 20 databases per server

Exchange Server 2007 (v8, code name E12, or with SP1 v8.1) runs only on 64-bit x86-64 versions of Windows Server

Exchange server 2007 comes in two editions:

Exchange Server 2007 Standard edition and Exchange Server 2007 Enterprise Edition.

Standard edition can have 5 Storage groups with 5 database each, while in Enterprise edition this is extended to 50 Storage group and 50 databases per storage group.