Date: Sept 2008
Product & Version: NVBU 8.0 Update 1 and above
OS Version: Windows 2003
Module & Version: Exchange and Mailbox Plugins.
Application version:Exchange 2000/3
Items inside the mailbox displayed with '?' instead of foreign language characters. Even after restoring items still display with '?'.
Change the "regional and language options" on the Exchange Server (Start > Control Panel > Regional and Language Options > Regional Options and Languages tabs).