Is it like this (maybe without the yellow warning at the top)
this - from microsoft
In Microsoft Windows Vista, the Dynamic HTML Editing ActiveX control is being removed from the Internet Explorer browser. As a result, there is functionality missing that Microsoft Exchange 2003 Outlook Web Access relies on. This update replaces that deprecated functionality on the Microsoft Exchange 2003 servers so that Microsoft Exchange 2003 Outlook Web Access continues to function smoothly.
Unfortunately there is a server fix only..So speak to your IT team (slackers - they should be have been on this already!)
You could try updating IE or using another browser - BUT if you do use say Firefox OWA will look very different and will function differently....