Microsoft Outlook Web App Font problem

I've been using the Outlook Web App with my company and we have a problem with fonts.

The default fonts people are getting : Arial, Courrier New, Helvetica, Tahoma, Times New Roman and Verdana.

We have 5 other workers who have more fonts than the above mentioned ones. The only difference on their PCs is that they have their account configured directly with the desktop Outlook. When they access the Web App version, they get all the fonts that are included in the desktop Outlook install.

Does this mean that Outlook needs to be installed and configured in order to get more fonts with the Web App?

Thanks in advance

Regards,

Marc