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Server-side licensing
As has been the case with Exchange for quite some time, the server-side of Exchange 2007 is provided in either a Standard or an Enterprise package. Before Exchange 2007, the primary differences between the Standard and Enterprise editions included:
Standard Edition | Enterprise Edition | |
Number of storage groups per server | 5 | 50 |
Total possible databases per server | 5 | 50 |
Maximum database size (per DB) | 16TB | 16TB |
Clustering | Not available | Available |
Local replication | Available | Available |
When it comes to database size, Exchange 2007 does not make any differentiation between the two editions. Each database can be up to 16 TB. Where Exchange 2007 Enterprise beats out Standard is in the number of stores and storage groups available on the server. The Enterprise edition also features clustering options not available on Standard, such as Single Copy Clusters and Cluster Continuous Replication.
Client-side licensing
Longtime Exchange admins probably expect some server-side licensing differentiation. What is different with Exchange 2007, however, in the fact that Microsoft is also making feature differentiation on the client access licenses necessary for every user that uses Exchange. Exchange 2007 features two client access licenses, also called Standard and Enterprise, but in no way related to the server edition names. Further, if you want the benefits of the Enterprise CAL, which includes Unified Messaging, you need to purchase both a Standard and an Enterprise CAL. Exchange 2007’s CALs are what Microsoft calls “additive” meaning that you need to stack the licenses in order to get all of the features of all licenses. See the table below.
Standard | Enterprise | |
E-mail, calendars, contacts, tasks | Yes | No |
Access via Outlook Web Access | Yes | No |
Exchange ActiveSync (to sync mobile devices) | Yes | No |
Unified Messaging | No | Yes |
Per-User or Per-Distribution List Journaling | No | Yes |
Managed E-mail Folders | No | Yes |
Exchange Hosted Filtering | No | Yes |
Forefront Security for Exchange Server | No | Yes |
Notice that normal e-mail functionality is not allowed with just the Enterprise CAL. If you want e-mail, calendaring, and other typical Exchange functionality, you need to buy the Standard CAL. If you want advanced features, such as Unified Messaging or Forefront, you need to buy two CALs.
Note that Standard vs. Enterprise is not an all-or-nothing proposition. For example, if you have only a few users that need functionality provided by the Enterprise CAL (such as Unified Messaging), you need only to buy Enterprise CALs for those users. For all others, you can stick with the Standard option.
To add another wrinkle to the mix, you must also decide whether or not you want to pay Software Assurance (SA) for your Enterprise CAL. If you do not subscribe to SA with your Enterprise CALs, you cannot use Exchange Hosted Filtering or Forefront Security for Exchange as these are subscription services. See my previous tip for an explanation of Exchange Hosted Filtering.
If you currently have an older version of Exchange and are paying Software Assurance, you are entitled to Exchange 2007 Standard CALs only.
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