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You probably are aware that a virus is malicious code that infects your system and typically causes some type of damage. The action caused by a virus can be as innocuous as displaying a message or as damaging as deleting data from your hard disk. One especially insidious form of virus, called a worm, spreads itself automatically, often by mailing itself to every contact in the infected system s address book. Because of the potential damage that can be caused by viruses and worms, it is critically important to guard against malicious code entering your system. Outlook 2007 offers two levels of attachment security to guard against virus and worm infections: Level 1 and Level 2. Outlook 2007 automatically blocks Level 1 attachments, a category that includes almost 40 le types known to be potentially harmful to your system for example, .exe and .vbs les. If you receive a Level 1 attachment, Outlook 2007 displays a paper clip icon beside the message but does not allow you to open or save the attachment. If you try to send a Level 1 attachment, Outlook 2007 displays a reminder that other Outlook 2007 users might not be able to receive the attachment and gives you the option of converting it to a different le type (such as a .zip le) before sending it. If you receive a Level 2 attachment, Outlook 2007 allows you to save the attachment to disk but not open it directly. You can then process the le with your virus checker before opening it.
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Your virus scanner is only as good as its de nition le. New viruses crop up every day, so it s critical that you have an up-to-date virus de nition le and put in place a strategy to ensure that your virus de nitions are always current.
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If you use Exchange Server to host your mailbox, the Exchange Server administrator can con gure Level 1 and Level 2 attachments, adding or removing attachment types for each level. In addition, Outlook 2007 allows all users to control the security-level assignments for attachments.
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For a detailed discussion of Outlook 2007 virus protection, see Virus Protection in 14.
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Although viruses were once found almost exclusively in executable les, viruses embedded in documents containing macros have become very common, and Microsoft Of ce system documents are as subject to them as any other les. However, Outlook 2007 and
Security Provisions in Outlook
other Microsoft Of ce system applications provide a means for you to guard against macro viruses. In Outlook 2007, you can select one of four options for macro security, as shown in Figure 2-14.
To learn how to con gure and use macro virus protection, see Virus Protection in 14.
Figure 2-14. Use macro security to prevent macro-borne viruses from affecting your system.
Digital Signatures
Outlook 2007 allows you to add a certi cate-based digital signature to a message to validate your identity to the message recipient. Because the signature is derived from a certi cate that is issued to you and that you share with the recipient, the recipient can be guaranteed that the message originated with you, rather than with someone trying to impersonate your identity.
For information about how to obtain a certi cate and use it to digitally sign your outgoing messages, see Protecting Messages with Digital Signatures in 14.
In addition to signing your outgoing messages, you can also use secure message receipts that notify you that your message has been veri ed by the recipient s system. The lack of a return receipt indicates that the recipient s system did not validate your identity. In such a case, you can contact the recipient to make sure that he or she has a copy of your digital signature.
Note
Although you can con gure Outlook 2007 to send a digital signature to a recipient, there is no guarantee that the recipient will add the digital signature to his or her contacts list. Until the recipient adds the signature, digitally signed messages are not validated, and the recipient cannot read encrypted messages from you.
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