151 Outlook Web Access Content Expiration in Windows 2000 and Windows Server 2003. Log Buffers If you previously tuned the msExchESEParamLogBuffers attribute manually (for example, to 9000 [an Exchange 2000 SP2 recommendation], or 500 [an Exchange 2000 SP3 recommendation]), clear the manual tuning. Exchange Server 2003 uses an optimal default value of 500. For detailed steps about how to correctly configure the msExchESEParamLogBuffers attribute for Exchange Server 2003, see How to Set the msExchESEParamLogBuffers Attribute for Exchange. Max Open Tables If you tuned the msExchESEParamMaxOpenTables attribute manually, you should clear the manual tuning. Exchange 2003 automatically calculates an optimal default value based on the number of processors in the server. For detailed steps on how to correctly configure the msExchESEParamMaxOpenTables attribute for Exchange Server 2003, see How to Set the msExchESEParamMaxOpenTables Attribute for Exchange Server 2003. 152 Uninstalling Exchange Server 2003 After ensuring that your organization meets certain prerequisites, you can run Exchange Setup to uninstall Exchange Server 2003. For detailed steps, see How to Uninstall Exchange Server 2003. How to Remove the Initial Memory Percentage Registry Value The Initial Memory Percentage registry setting was introduced as mechanism for fine tuning the initial amount of memory allocated to the Exchange information store to 10 percent of the total physical memory in the Exchange server. By starting out with this initial allocation and then growing from there, virtual memory fragmentation does not occur as frequently. This registry value should not be set arbitrarily, and should only be used on the advice and direction of Microsoft Product Support Services (PSS). Exchange Server 2003 includes support for special startup switches in Windows 2000 Advanced Server and Windows Server® 2003 that help reduce virtual memory fragmentation, and additional changes were made to help prevent virtual memory fragmentation in Exchange Server clusters. Therefore, the Initial Memory Percentage registry value is no longer needed on Exchange Server 2003. 153 The Initial Memory Percentage registry value works only on computers that are running Exchange 2000 Server. Exchange Server 2003 will ignore this value if present, and the value will have no effect. Therefore, you should remove this registry entry before upgrading this Exchange Server from Exchange 2000 Server to Exchange Server 2003. Before You Begin Before you perform the procedure in this topic, be aware that the procedure contains information about editing the registry. Caution: Incorrectly editing the registry can cause serious problems that may require you to reinstall your operating system. Problems resulting from editing the registry incorrectly may not be able to be resolved. Before editing the registry, back up any valuable data. Procedure To remove the Initial Memory Percentage registry setting 1. Start Registry Editor. 154 2. Navigate to HKLM\System\CurrentControlSet\Services\MSExchangeIS\ ParametersSystem 3. In the right pane, delete the Initial Memory Percentage registry value. 4. Close Registry Editor and restart the Microsoft Exchange Information Store service for the change to take effect. For More Information For information about a known issue when you use this registry value, see Microsoft Knowledge Base article 810883, ""Initial Memory Percentage" Registry Value Has No Effect" (http://go.microsoft.com/fwlink/?LinkId=3052&kbid=810883). For information about how to edit the registry, see Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows Registry" (http://go.microsoft.com/fwlink/?linkid=3052&kbid=256986). How to Remove the MPHeap Parallelism Registry Value In Exchange 2000, each time the Microsoft Exchange Information Store service is started, the Exchange store process (Store.exe) gets its initial 155 process-heap. Then, a module loaded in the information store process— ESE.DLL—allocates 4 JET heaps for each processor present in the system. Note: Although these heaps are separate pools of memory in the information store process, they are collectively referred to as the ESE multi-heap. On a single CPU system, ESE allocates 4 JET heaps. On a dual CPU system it allocates 8; on a quad system it allocates 16; and so forth. When Exchange 2000 was installed on systems with four or more CPUs, it was found that the ESE multi-heap caused excessive virtual memory consumption, which in turn led to performance problems. To correct this problem, it was recommended that customers with large Exchange 2000 servers add the MPHeaps parallelism registry value to their systems. Exchange 2003 now automatically calculates the optimum number of heaps to allocate based on the unique specifications of each system. Therefore, the MPHeaps parallelism registry value should be removed from Exchange 2000 servers after Exchange Server 2003 is installed. 156 Before You Begin Before you perform the procedure in this topic, be aware that the procedure contains information about editing the registry. Caution: Incorrectly editing the registry can cause serious problems that may require you to reinstall your operating system. Problems resulting from editing the registry incorrectly may not be able to be resolved. Before editing the registry, back up any valuable data. Procedure To remove the MPHeap parallelism registry value 1. Start Registry Editor. 2. Navigate to HKLM\Software\Microsoft\ESE\Global\OS\Memory 3. In the right pane, delete the MPHeaps parallelism registry value. 4. Close the registry editor and restart the Microsoft Exchange 157 Information Store service for the change to take effect. For More Information For information about how to edit the registry, see Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows Registry," (http://go.microsoft.com/fwlink/?linkid=3052&kbid=256986). How to Configure Outlook Web Access Content Expiration in Windows 2000 and Windows Server 2003 Microsoft Outlook Web Access 2003 is comprised partially of static files, such as image files, scripts and so forth. To optimize performance, it is recommended that the Exchweb virtual directory have its content expiration set to 1 day. Procedures To configure Outlook Web Access content expiration in Windows 2000 1. Open Internet Information Services Manager. 158 2. Expand the server, and then expand Default Web Site. 3. Right-click the Exchweb virtual directory, and then click Properties. 4. Click the HTTP Headers tab. 5. Ensure that the Enable content expiration check box is selected. 6. Set the Web site content should field to Expire after 1 Day(s). 7. Click OK to save the change. To configure Outlook Web Access content expiration in Windows Server 2003 1. Open Internet Information Services Manager. 2. Expand the server, expand Web Sites, and then expand Default Web Site. 3. Right-click the Exchweb virtual directory and click Properties. 159 4. Click the HTTP Headers tab. 5. Ensure that the Enable content expiration check box is selected. 6. Set the Web site content should field to Expire after 1 Day(s). 7. Click OK to save the change. How to Set the msExchESEParamLogBuffers Attribute for Exchange The msExchESEParamLogBuffers storage group attribute governs the number of Extensible Storage Engine (ESE) log buffers that are used by the Exchange information store. ESE uses a set of log buffers to hold information in RAM before it writes to the transaction logs. Using these buffers improves transaction logging performance. For large servers, the default value of 84 is too low. This can cause excessive disk I/O operations to the transaction log drive and, therefore, significant decrease in performance if the server is under load or if users are sending large messages. Increasing the number of ESE Log Buffers improves performance, although it also causes more virtual memory usage. 160 To correctly set this value, use the following information: For Exchange 2000 Server, Exchange 2000 Server Service Pack 1 (SP1), or Exchange 2000 Server Service Pack 2 (SP2), set this value to 9000. For Exchange 2000 Server Service Pack 3 (SP3), set this value to 512. For Exchange Server 2003, a default value of 500 is used, and you should change the value for the msExchESEParamLogBuffers attribute to 9000. Note: If you previously tuned log buffers to 9000, make sure that you manually reduce this setting after you apply Exchange 2000 Server SP3. This change is not made automatically when you install Exchange 2000 Server SP3. If you have log stalls, this may be caused by too low a buffer and you can raise this value to 9000. The Database\Log Record Stalls/sec performance counter can be monitored to determine whether log stalls . Exchange Server 2003. 152 Uninstalling Exchange Server 2003 After ensuring that your organization meets certain prerequisites, you can run Exchange Setup to uninstall Exchange Server 2003. . information: For Exchange 2000 Server, Exchange 2000 Server Service Pack 1 (SP1), or Exchange 2000 Server Service Pack 2 (SP2), set this value to 9000. For Exchange 2000 Server Service Pack. direction of Microsoft Product Support Services (PSS). Exchange Server 2003 includes support for special startup switches in Windows 2000 Advanced Server and Windows Server 2003 that help