The display name of an e-mail address is not encoded correctly according to RFC 2047 when you use extended characters in Exchange Server 2007

In a Microsoft Exchange Server 2007 environment, you send an e-mail message to an external user. However, the e-mail address is not correctly encoded according to RFC 2047. This problem occurs if the following conditions are true:

• The display name of the recipient or of the sender is in the Lastname, Firstname format.
• The display name of the recipient or of the sender contains an umlaut.

For example, a display name such as "Jürgen, Müller" is displayed as follows in the header of the received message: A comma is missing. The display name in the header should be displayed as follows:Note This problem may cause some third-party applications such as an SMTP relay server or a POP3 client not to work successfully when the application parses the e-mail address.

To resolve this problem in Exchange Server 2007 Service Pack 1, install Update Rollup 1 for Exchange Server 2007 Service Pack 1. For more information about Update Rollup 1 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: To resolve this problem in the release version of Exchange Server 2007, install Update Rollup 6 for Exchange Server 2007. For more information about Update Rollup 6 for Exchange Server 2007, see the following Exchange Help topic: For more information about how to install the latest Exchange service pack or update rollup, see the following Exchange Help topic:

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: For more information about the naming schema for Exchange Server software updates, click the following article number to view the article in the Microsoft Knowledge Base:

For more information about RFC 2047, visit the following Internet Engineering Task Force (IETF) Web site:The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.