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After you install Update Rollup 5 for Microsoft Exchange Server 2007 Service Pack 1 on an Exchange server, the Japanese (1 byte Kana) characters in the subject and in the display name are corrupted when you try to reply or forward task requests or calendar items in a Microsoft Office Outlook client.
To resolve this problem, install Update Rollup 8 for Exchange 2007 Service Pack 1. For more information about Update Rollup 8 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: