When PureMessage for Microsoft Exchange replaces blocked phrases containing extended (Japanese) characters, the details of the blocked phrase in the replacement text may not be displayed correctly.
Note: Only systems using a MAPI mail client (Microsoft Outlook and Outlook Web Access) to send mail through a Microsoft Exchange 2007 server are affected.
This is a known issue.
Sophos product name and version
PureMessage for Microsoft Exchange, version 3.0.1