Delete your e-mail setting and mailbox from the N900 and re enter them.
Reply if problem is solved.
yeah, did that, and just to appease the willingess for you post, i did it again, but still the same.
wierd, i have recieved a couple of email that have jpg files in them and they were fine. but the large majority are coming through as winmail.dat files. this includes what are supposed to be pdf's/doc/xls, etc.
maybe next firmware.
hope it comes as a christmas present from santa's usb cable!
silly question do you have the "to go" viewer apps installed?
if you are using MFE exchange
An administrator can prevent an existing user account (Microsoft Exchange user or custom recipient) from sending RTF information by clicking to clear the MAPI Recipient check box on the Advanced property page of the recipient's properties. An administrator can view the recipient's properties by clicking the recipient name, and then clicking Properties on the File menu
winmail.dat.. Microsoft's answer to a problem noone was having.. urgh.. I mainly put emails containing those attachments in the deleted items folder and consider it anti-social to send mail in that format..
The long and short is that it is the sender's problem.. not a fault with your mail client at the receiving end..
This is a pretty good run down of why it is bad..
Though that mightn't help you very much