Pro-Exchange,Lync & Office 365
Belgian Microsoft Unified Communications Professionals
Microsoft Exchange Server, Microsoft Lync Server & Office 365
Exchange Server Performance Troubleshooting

During our last Chalk Talk session @ Techdays belgium someone asked a question about Exchange Server Performance Troubleshooting.


The problem was that Clients were experiencing the famous “Requesting Data” notification in Outlook.
They had different Outlook versions throughout the company, Outlook 2002 aka XP, 2003 & 2007.

The Outlook XP users were experiencing the most problems.
The question was how can we troubleshoot this?


Looks like a simple question right?  There are so many things that can cause performance issues on an Exchange server.
Memory, CPU, Storage, 3rd Party Server Applications, 3rd Party Client Applications, Mailbox size, Mailbox items, Server views, Network, Active Directory …
You see there is no single answer to this question…

Any of the following sections can help you in the design/validation/troubleshooting process

1. Outlook and Exchange Server Compatibility

Let’s look at a roster of Outlook clients supported for Exchange 2007


So Outlook 2002/XP is supported for Exchange 2007.

2. Exchange Server Sizing

Processor and memory configurations for Exchange Server 2007 Server Role

3. Storage Related Information


4. Pre-Deployment Testing/Verification tools

5. Active Directory Testing

6. Exchange Analysers

Introducing the Exchange Analyzers

Read about the features, abilities, and future vision for the Exchange Analyzer family. Visit the Exchange Team Blog for the details.

  • Exchange Remote Connectivity Analyzer
    The Exchange Remote Connectivity Analyzer tool is a Web-based tool designed to help IT Administrators troubleshoot connectivity issues with their Exchange Server deployments. The tool simulates several client logon and mail flow scenarios. When a test fails, many of the errors have troubleshooting tips to assist the IT Administrator in correcting the problem.


  • Exchange Best Practices Analyzer
    The Microsoft Exchange Best Practices Analyzer is designed for administrators who want to determine the overall health of their Exchange servers and topology. The tool scans Exchange servers and identifies items that do not conform to Microsoft best practices.


  • Exchange Troubleshooting Assistant
    The Exchange Troubleshooting Assistant programmatically executes a set of troubleshooting steps to identify the root cause of performance, mail flow, and database mounting issues. The tool automatically determines what set of data is required to troubleshoot the identified symptoms and collects configuration data, performance counters, event logs and live tracing information from an Exchange server and other appropriate sources. The tool analyzes each subsystem to determine individual bottlenecks and component failures, then aggregates the information to provide root cause analysis.

7. Performance Troubleshooting tools

  • Microsoft Exchange Server User Monitor
    Use the Microsoft Exchange Server User Monitor to gather real-time data to better understand current client usage patterns, and to plan for future work. Administrators can view several items, including IP addresses used by clients, versions and modes of Microsoft Office Outlook, and resources such as CPU usage, server-side processor latency, and total latency for network and processing with Outlook 2003 version MAPI.
  • Description of the Exchange Server Performance Troubleshooting Analyzer tool
    Run the Exchange Server Performance Troubleshooting Analyzer tool when the problem is occurring. The tool will complete the following tasks:
    • Identify performance problems that may cause Microsoft Outlook to display the RPC Cancel Request dialog box.
    • Analyze the data in the Microsoft Exchange Server User Monitor tool (Exmon.exe) event trace log file (.etl) to determine whether a load issue is caused by one or two users or by many users.


  • Performance Analysis of Logs (PAL) Tool
    The PAL (Performance Analysis of Logs) tool is a new and powerful tool that reads in a performance monitor counter log (any known format) and analyzes it using complex, but known thresholds (provided). The tool generates an HTML based report which graphically charts important performance counters and throws alerts when thresholds are exceeded. The thresholds are originally based on thresholds defined by the Microsoft product teams and members of Microsoft support, but continue to be expanded by this ongoing project. This tool is not a replacement of traditional performance analysis, but it automates the analysis of performance counter logs enough to save you time. This is a VBScript and requires Microsoft LogParser (free download).


  • ExInsight for Microsoft Exchange
    ExInsight is a free monitoring and statistics tool that provides a real-time view of the internals of Exchange Server transactions and allows you to evaluate individual user's usage of Exchange Server.
    This tool is especially useful for Exchange administrators and developers. By using this tool, you can gather real-time data about the users in an Exchange environment and learn more about the inner workings of MAPI, OWA, POP3, IMAP4, NNTP and other protocols. ExInsight helps you to understand how individual users affect the performance of an Exchange Server, analyze application usage of Microsoft Exchange, and guide troubleshooting of applications that depend on Microsoft Exchange.


8. Performance Issues

This section provides information about how to isolate performance degradations in Microsoft Exchange Server 2007. Information is also provided about tools that may assist you in performance troubleshooting.

  • Understanding the Performance Impact of High Item Counts and Restricted Views
    This topic will help you understand, diagnose, and resolve Microsoft Exchange Server 2007 performance issues related to high item counts in critical path folders and restricted view requests when you use Microsoft Office Outlook running in online mode, Outlook in cached mode with delegate access, and Outlook Web Access. The critical path folders are the Calendar, Contacts, Inbox, and Sent Items folders. Restricted views are data views that restrict information based on search criteria that result in views of only a subset of items in a folder. Performance issues related to these situations are frequently related and can become visible to end-users in the form of slow client access. It only takes a few users who have abnormally high item counts in their critical path folders to cause performance issues which are felt throughout your whole Exchange organization.


  • Troubleshooting Slow RPC Request Processing Issues
    When you use Microsoft Office Outlook in MAPI mode, Outlook executes client operations as remote procedure calls (RPCs) between the client and the server. If the user is running in online mode, these RPC calls occur synchronously. Any delay by the server in fulfilling these synchronous requests directly affects the user experience and the responsiveness of Outlook. In contrast, most operations that are performed when you run in cached mode occur against the user’s local copy of the mailbox or are issued to the server in the form of asynchronous (background) RPCs. Generally, asynchronous RPCs do not affect the responsiveness or overall experience of the Outlook client itself.


9. Monitoring

10. Some very interesting blog reading:

Posted 04-13-2010 1:26 by Johan Delimon


Exchange 2007 wrote Mark Russinovich to the recue : Outlook Hangs (Requesting Data)
on 08-25-2010 2:10

We have all seen this before! Outlook hangs and is requesting data, Mark shows us how you can actually

Exchange 2010 wrote Exchange Troubleshooting : Performance Analysis of Logs (PAL) Updated
on 11-09-2011 10:10

This is a tool that is very helpfull when troubleshooting performance problems on Exchange Servers PAL wrote
on 09-13-2014 1:03

Exchange Server Performance Troubleshooting - Exchange 2007 - Pro-Exchange,Lync & Office 365

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