You didn't have all the Hebrew code pages installed when you installed Office. First, install all the relevant code pages in the Regional Settings in the Control Panel (look under "Advanced..."). Honestly, I don't know which code pages are needed - so I just install all of them. Additionally, I recommend using the "Set default..." button to set the default language to Hebrew.
Once you've done that, you need to tell Outlook to refresh the character set it uses.
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