Why does Outlook Express block my e-mail attachments after installing SP2?
Outlook Express now includes higher security features, and because of this higher security certain e-mail attachments that could potentially cause harm to your computer are blocked. Whenever Outlook Express opens an e-mail that has an attachment, it now calls Attachment Manager to determine if the attachment is safe. The Attachment Manager functionality calculates the risk level of the file, and then compares it to the zone of the file’s source. Since e-mail does not have a real source, it uses the Untrusted (E-mail) zone. An API call calculates the zone and appropriate index row in the table.
