Attachements showing up as winmail.dat

I just moved from a Windows XP machine to a MAC and I'm having problems receiving attachements.
I'm using Entourage as my mail client.
I've sent some emails containing attachments to myself recently from my Windows machine using Outlook 2003 and to other people with our company.
When look at the email on my MAC their is no attachment but a winmail.dat file.
If I look at the email back on my windows machine it is corrrect (Both Outlook and Entourage are configured to check the same account). I quized the other people within our company as they are also using MACs and they stated the attachments came thru fine.
Any idea why the problem seems to be unique to my new MAC?
Regards,
Mike
Mac OS X (10.4.6)
Mac OS X (10.4.6)

The above answers are absolutely correct. And to give a little more information on this problem, I am quoting this almost verbatim from John Rizzo's recent article in MacWorld magazine:
=================
It's bound to happen. Occasionally, you'll receive an un-openable email attachment named winmail.dat from one of your Windows friends, and he or she will insist that the attachment was a Microsoft Word file or some other type of a file.
First things first: DON'T BLAME YOUR MAC!! The fault lies on the Windows side, in Exchange Server & Outlook for Windows. When Outlook sends an email message in Rich Text Format over the Internet, Exchange Server sometimes creates an attachment called Winmail.dat, containing the message and some encoding data.
One quick fix is to download and install the utility "TNEF's Enough" on your Mac:
http://www.joshjacob.com/macdev/tnef/index.html
This utility can extract a Mac-usable file from a Winmail.dat attachment in a few seconds.
But running that utility all the time will get old pretty quickly if your friends are sending you lots of attachments and they're all winmail.dat files. If you're getting lots of attachments like this, an even better fix is to ask your Windows friends to turn off RTF in Outlook for Windows. They would choose Tools->Options, select the "Mail Format" tab, and then specify "Plain Text" in the "Send In This Message Format" list, and then click on OK. Once they do that, you will not receive those winmail.dat files in the future.
OR, the best of all fix would be for them to point their network administrators to the Microsoft Knowledge Base article "How to Prevent the winmail.dat file from being sent to Internet Users" at http://support.microsoft.com/kb/q138053/
Power Mac G4 QuickSilver Dual 800 MHz Mac OS X (10.4.4)

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