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When users use Microsoft Internet Explorer 5 or later to gain access to Microsoft Outlook Web Access (OWA) and send a message, recipients who have mail clients that are not Unicode Translation Format-8 (UTF-8) aware cannot view the message.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
To work around this problem, turn the feature to use regional characters on. To do this, follow these steps:
Click Start, click Run, type Services.msc, and then click OK.