Consider the following scenario:
You select the Date and Time Format option on the Settings page on a telephone that is running Microsoft Lync 2010 Phone Edition in Simplified Chinese.
You select a date format.
In this scenario, the date and time format that is displayed in the call logs and the voice mail list does not match the format that you selected.
To resolve this issue, install the following cumulative update:
For Polycom CX500, Polycom CX600 and Polycom CX3000 telephones:
2577594 Description of the cumulative update for Lync 2010 Phone Edition for Polycom CX500, Polycom CX600, and Polycom CX3000: July 2011
For Aastra 6721ip and Aastra 6725ip telephones:
2577595 Description of the cumulative update for Lync 2010 Phone Edition for Aastra 6721ip and Aastra 6725ip: July 2011