This is a newsgroup for questions relating to Microsoft Access, the database
management program. You will probably have better luck posting your question
in a newsgroup related to email, perhaps:
If you are referring to Windows Explorer, it is not an email client, so I
don't think you can do that.
Also, please ask your question in an appropriate newsgroup such as in the
microsoft.public.outlook.* hierarchy. This newsgroup is for MS Access, The
database product.