Mio DigiWalker A501 User Manual page 117

NOTE:
Embedded images and objects cannot be received as attachments.
An embedded message can be viewed as an attachment when using IMAP4 to
receive e-mail. However, this feature does not work if TNEF is enabled so that you
can receive meeting requests.
To store attachments on a storage card rather than on the device, tap the Menu soft
key Tools Options Storage, and select the Store attachments on a
storage card check box.
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Microsoft Pocket Outlook