I don't use Exchange, but a POP3 account. But I am using WM6 and I am able to read my attachments. What file types are these attachments?

I would check with your IT dept. I am guessing they have blocked some types of attachments.

 Can you confirm what file type these are.

And is it ALL attchments or just certain? Has it ever worked? 

 Can you also confirm if this is Over-the-air or cradled?

I reflashed my phone and the attachments are now showing up as they should once I download them.  I can only assume there was something that did not go as it should have that caused the problem.  At any rate, all is now well with the email attachemtns.

 Thanks all

 Good to hear it is fixed, shame it was so drastic.

Make sure you keep an eye on it and if it ever happens again, note down everything you had performed on the device prior to it, it may also be a simple explanation!