Microsoft 1 Blocking Attachments at the Client

Microsoft Exchange 2000 Operations Guide — Version 1.078

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 File Type

.ade Microsoft Access project extension

.adp Microsoft Access project

.bas Microsoft Visual Basic class module

.bat Batch file

.chm Compiled HTML help file

.cmd Microsoft Windows NT command script

.com Microsoft MS-DOS program

.cpl Control Panel extension

.crt Security certificate

.exe Executable

.hlp Help file

.hta HTML program

.inf Setup information

.ins Internet naming service

.isp Internet communication settings

.js Javascript file

.jse Javascript encoded script file

.lnk Shortcut

.mdb Microsoft Access program

.mde Microsoft Access MDE database

.msc Microsoft Common Console document

.msi Microsoft Windows Installer package

Contents

Main ii Contents Chapter 1 Introduction 1 Chapter 2 Capacity and Availability Management 11 Change and Configuration Management 37 Chapter 4 Enterprise Monitoring 53 Chapter 5 Protection 71 Chapter 6 Glossary 97 Support 89 Page Page Page Introduction Microsoft Operations Framework (MOF) Page How to Use This Guide Efficiency, Continuity, and Security Figure 1.2 Efficiency Continuity Security Chapter Outlines Planning and Deployment Service Level Agreements Features Performance Recovery Support Related Topics Page Capacity and Availability Management Capacity Management Page Page Availability Management Service Hours Service Availability Minimizing System Failures Decreasing Single Points of Failure Increasing the Reliability of Exchange 2000 Minimizing System Recovery Time Performance Tuning Making Changes to the Registry No Performance Optimizer Optimizable Features Tuning Considerations Upgrading from Exchange 5.5 to Exchange 2000 Tuning the Message Transfer Agent (MTA) Tuning SMTP Transport Mailroot Directory Location SMTP File Handles Page Store and ESE Tuning Online Store Maintenance Online Backups Choosing the Correct Maintenance Strategy Extensible Storage Engine (ESE) Heaps Store-Database Cache Size Page Log Buffers Tuning Active Directory Integration Page Tuning Outlook Web Access (OWA) Page Hardware Upgrades Page Change and Configuration Management Prerequisites Change Management Defining Change Type Step 1 Request for Change Is Submitted to Change Manager Step 2 Change Manager Assesses the RFC Step 3 Change Is Passed to IT Executive Committee for Approval Step 4 Change Is Passed to the Change Advisory Board for Scheduling Step 5 Change Is Passed to the Change Owner Step 6 Change Process Evaluation Minor and Standard Changes Scripting Minor and Standard Changes Security Software Control and Distribution Documentation Configuration Management Tools for Configuration Management Configuration Management and Change Management Configuration Items Page Page Page Defining Configuration Items Configuration Management and Exchange Maintaining the Configuration Management Database Change Management Ownership Security Backup Exchange System Policies Administering System Policies Page Enterprise Monitoring Prerequisites Performance Monitoring System Monitor Exchange 2000 Objects and Counters to Monitor Service or Resource Performance Object Information Store Counters SMTP Server MSExchangeMTA and MSExchangeMTAConnections MSExchangeIM Virtual Servers MSExchangeAL Windows 2000 Objects and Counters to Monitor Table 4.2 Subjects and Associated Objects and Counters Subsystem Object Counter Exchange Comments Subsystem Object Counter Exchange Comments Centralized Monitoring Event Monitoring Event Viewer Log Files Centralized Event Monitoring Availability Monitoring Monitoring and Status Tool Adding Services to the Default Configuration Monitoring Resources Notifications Status Disabling Server Monitoring Centralized Availability Monitoring Client Monitoring Page Page Protection Chapter Start Point Chapter End Point Protection Against Hacking Firewall Operations Maintaining Firewall Availability Ensuring That Only the Correct Traffic Passes Through the Firewall Monitoring Against Hacker Intrusion Dealing With Security Breaches Anti-Virus Measures Staying Current Dealing With Virus Infection Blocking Attachments at the Client Page Disaster Recovery Procedures Backing Up Page Offline Backup Disk Imaging Restoring Recovering Individual Messages Recovering Lost Mailboxes Recovering Exchange Stores and Storage Groups Full Exchange Server Recovery Recovering Exchange After Active Directory Failure Alternate Server Recovery Recovery Testing Page Page Support Providing Support for End Users Reducing End User Support Costs Page Problem Reporting Dealing with User Problems Notifying Users Exchange Problem Management Page Page Glossary