Blocking Attachments At The Client - Microsoft Exchange 2000 Operation Manual

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Microsoft Exchange 2000 Operations Guide — Version 1.0

Blocking Attachments at the Client

One of the best ways of protecting against virus infection is to block particular attach-
ments from running. Attachments may be blocked at the server level, but they may also be
blocked at the client. You can install a security patch on Microsoft Outlook 98 and
Outlook 2000. This patch is built into Outlook 2000 Service Release 2 and Outlook 2002
(a component of Microsoft Office XP). The effect of this to prevent certain attachments
from running directly from the client (instead they must be saved first) and to prevent
other attachments (those considered more dangerous) from being downloaded at all.
Table 5.2 shows the attachments that are prevented from running.
Table 5.2 File Extensions and File Types
File Extension
.ade
.adp
.bas
.bat
.chm
.cmd
.com
.cpl
.crt
.exe
.hlp
.hta
.inf
.ins
.isp
.js
.jse
.lnk
.mdb
.mde
.msc
.msi
File Type
Microsoft Access project extension
Microsoft Access project
Microsoft Visual Basic class module
Batch file
Compiled HTML help file
Microsoft Windows NT command script
Microsoft MS-DOS program
Control Panel extension
Security certificate
Executable
Help file
HTML program
Setup information
Internet naming service
Internet communication settings
Javascript file
Javascript encoded script file
Shortcut
Microsoft Access program
Microsoft Access MDE database
Microsoft Common Console document
Microsoft Windows Installer package