The BlockedClientVersions parameter is set on an Exchange 2010 Client Access server

[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at]  

Topic Last Modified: 2010-04-01

The Microsoft Exchange Best Practices Analyzer examines the protocols that are enabled on Microsoft Exchange Server 2010 Client Access servers. During this examination, the Best Practices Analyzer determines whether the BlockedClientVersions parameter has been set on any Client Access servers in the organization. If the BlockedClientVersions parameter has been set, the following message is generated:


BlockedClientVersions is set on <ServerName>. The current value is <StringValue>.

The BlockedClientVersions parameter is used together with the Set-RpcClientAccess cmdlet to manage the Exchange RPC Client Access service on an Exchange 2010 Client Access server. This parameter specifies which versions of Microsoft Outlook are restricted from connecting to Exchange. The Exchange RPC Client Access service rejects connections from versions of Outlook that are specified in the parameter.

By default, the BlockedClientVersions parameter is not set on Exchange 2010 Client Access servers. This message does not indicate that a problem exists with the Exchange configuration. Instead, this message is intended to inform an administrator that certain versions of Outlook have been blocked from connecting to Exchange. This information may be used to help troubleshoot any Exchange connectivity issues that exist.

For more information, see the following topics: