You have to have the proper character sets in your outlook.. you can try this I don't know what version of windows you have, this may also be your version of windows doesn't support the code page of the sender if you don't have Vista or above...
Click Start > Settings > Control Panel.
In Microsoft Windows XP, click Start > Control Panel.
In the Control Panel, double-click Add/Remove Programs.
Complete one of the following:
In Microsoft Windows 98, Microsoft Windows Millennium Edition (Me), or Microsoft Windows NT 4.0: On the Install/Uninstall tab, click Microsoft Office XP (or Microsoft Word 2002), and then click Add/Remove.
-OR-
In Microsoft Windows 2000, Microsoft Windows Server 2003 or Microsoft Windows XP: Click Change or Remove Programs, click Microsoft Office XP (or Microsoft Word 2002), and then click Change.
In the Office setup, select Add or Remove Features and click Next.
Select "Choose advanced customization of applications" by clicking on the check box. Click Next.
Click to expand Office Shared Features.
Click to expand International Support.
Click the icon next to Universal Font, and then click 'Run All' from My Computer on the shortcut menu.
Click Update to complete the installation of the Universal Font (Arial Unicode MS) to the computer.
Once the font has been installed, open ArcMap and add the data with the international characters.
Do not open the Attribute table until the next step is completed.
Click Tools > Options > Tables tab.
Set the Table Font to 'Arial Unicode MS' and click Ok. -show me-
Open the Attribute table. The characters should display correctly.
