Store attachments in a central location - If you do receive attachments, it is a good idea to store shared documents in a central location such as a TeamRoom database or file directory on the network. It not only saves space in your mail but it also helps guard against potential loss if damage occurs to your machine.
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If you need the email that the attachment came in, one suggestion is to
1 - detach the attachment
2 - edit the email, (Ctrl-E)
3 - enter the location of the attachment
4 - delete the attachment from the email
5 - save the mail message.
This way you have the relevant info to the attachment, without the attachment bulking up your mail file.