Assume that you try to rename a folder whose name contains non-English characters in Microsoft Outlook online mode or Outlook Web App. Then, you change a character or the full folder name from lowercase to uppercase characters (or vice versa). In this situation, the renaming fails.
To resolve this issue, install the following update rollup:
2936871 Update Rollup 6 for Exchange Server 2010 Service Pack 3
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about character sets, go to the following Microsoft website: