You log on to Microsoft Office Communicator 2007 R2 and then you set the font of a conversation window to bold, italic or to underline. In this situation, English messages can be sent. However, you cannot send non-English messages continuously in bold, italic or in underline font because the font automatically changes to normal.
To resolve this problem, install the following update rollup:
2028888 Description of the cumulative update package for Communicator 2007 R2: July 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.