The “LCMapString” function may return incorrect mapping results for some languages in Windows Server 2008 and in Windows Vista
In Windows Server 2008 and in Windows Vista, the LCMapString function may return incorrect mapping results for some languages.
Because of this issue, Exchange Server 2007 may enter an infinite loop when certain users connect to their mailboxes. Eventually, this behavior may consume all disk space, and the mail server may stop responding.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB955612.