winmail.dat in attachments , outlook express

To resolve the problem of winmail.dat , use the plain text format. To do this:

-> On the Tools menu, click Options, and then click Mail Format.
-> In Compose in this message format, click to select Plain Text, and then click OK.

NOTE: To send to certain recipients that use RTF format and others recipients that use plain text format, you must set the option for the recipient in either the Personal Address Book or the recipient's contact record.

Use the following steps to remove the RTF format from the recipient attribute in the Personal Address Book:

-> On the Tools menu, click Address Book.
-> In Show Names From, click the Personal Address Book.
-> Select the addressee that you want to set as plain text, and then click Properties on theFile menu.
-> In the SMTP-General tab, click to clear the Always send to this recipient in Microsoft Exchange rich text format check box, and then click OK.

Use the following steps to set plain text in the recipient's contact record:
-> Open the recipient's record in the Contacts folder.
-> Double-click the recipient's e-mail address.
-> In the E-Mail Properties dialog box, click Send Plain Text only under Internet Format.