1) When you
click the paper clip in the Preview pane, the
Save Attachments and the file name commands are unavailable
(they are pale grey). As in the following screen shot:

2) When you open an e-mail message, the Attach
field is missing from the e-mail message, and the following message is
displayed in the message alert bar at the top of the e-mail message:
"Outlook Express removed access to the
following unsafe attachments in your email: name of file"
The following screen shot shows Outlook Express 6 blocking access
to the attachment.

This behaviour occurs if the Do not allow
attachments to be saved or opened that could potentially be a virus
option is enabled, and the e-mail attachment is determined by Outlook
Express to be "unsafe".
By default, the Do not allow attachments to
be saved or opened that could potentially be a virus option
is enabled in Outlook Express 6 SP1.
When this virus-protection feature is enabled, Outlook Express
uses the Internet Explorer unsafe file list and the
Confirm open after download setting in
Folder Options to determine if a file is safe.
Any e-mail attachment with a file type that is reported as "unsafe"
is not downloaded, and access to the attachment is removed.
If you are sure that the attachment is safe to download or open,
use the following method:
NOTE: Because there are several versions of
Microsoft Windows, the following steps may be different on your
computer. If they are, see your product documentation to complete
these steps. This info is for Windows XP and Outlook Express 6 SP1
Turn off the Option to Use the Unsafe File
List
To turn off the Do not allow attachments to
be saved or opened that could potentially be a virus
option:
- Start Outlook Express 6.
- On the Tools menu, click
Options.
- Click the Security tab, click to
clear the Do not allow attachments to be
saved or opened that could potentially be a virus check box
under Virus Protection, and then
click OK.
The following screen shot shows the Security Tab in Outlook
Express 6 SP1:

Now close Outlook Express 6 and the settings will
take place once you restart the email program.
-----------
NB- Outlook 2000,
XP and 2003 have a
'feature' that blocks attachments based on the file extension too!
This is great for blocking viruses, but unfortunately, it also
blocks legitimate attachments from coming into your Inbox. Use
DetachOL
to change which file types are blocked, according to YOUR needs, not
those of the Outlook development team!
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In Windows Media Player!