Microsoft-outlook

When you receive a message in a different language, the message must be marked with information about the character set (alphabet) that was used to create it in order for Outlook 2000 to be able to display the message. When you forward or reply to the message, Outlook keeps the character set of the original message. Including character set information with a message is called encoding.
Occasionally, you may receive messages that aren't encoded. For these messages, Outlook uses the default encoding for unmarked messages that's specified for your computer. This default is set automatically based on the Regional Settings (system local settings) of your operating system. The default setting appears in the International Options dialog box. (On the Tools menu, click Options, click the Mail Format tab, and then click International Options.)
The default encoding might not work for some of the international messages that you receive. For example, if your default is Western European and you receive an unmarked message that uses a Greek character set, the message might display boxes or question marks instead of readable text. To fix this problem, you need to change the encoding of that specific message to Greek so Outlook can display the correct characters and provide Outlook Support to read and send the email massage.