Urgent: Users experience latency opening emails on outlook 2007 using Exchange 2007 SP3 RRS feed

  • Question

  • Dear Colleagues ,

    We are having a windows 2008 native domain with all exchange 2007 SP3 server roles .Users are compalining latency in opening their email attachment (about 30s ).How I can monitor the deficiency and what should I do . I had read article (  and monitored that counters but nothing wrong exist.

    The server has 16GB RAM where between 2.4 to 1.8 GB are free.


    Monday, April 18, 2016 12:18 PM


All replies

  • Hey Ali,

    Are your users configured for online mode or cached mode? What is the average mailbox size. And how many users do you have?

    How is disk space where your databases and logs are located? How is your disk I/O looking? Getting good IOPS?

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    Monday, April 18, 2016 2:29 PM
  • Hi,

    All users are online . I wanted to mention that store.exe process eats up to 14GB of RAM despite 16GB total server memory . I found that this is normal and we have 24GB Pagefile on the server.

    we have two sets of mailbox sizes as 1GB and 5GB for 1000 users .

    The storage is a hp P2000 with 4TB total size which is connected to the server via a SanSwitch and fibre optic

    I had monitored I/O per below article but everything was fine.


    Tuesday, April 19, 2016 10:34 AM
  • Hey Ali,

    Are your users accessing Outlook from a local computer, or, are they using Outlook remotely through RDP or VDI? If from a local computer I would recommend using cached mode. It is recommended over online mode for performance reasons.

    Cached mode is unsupported in RDP and VDI environments.

    If you do decide to go to cached mode I would also recommend upgrading your clients to Outlook 2013 as this offered a number of improvements to the way Outlook caches mailboxes.

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    Tuesday, April 19, 2016 12:43 PM
  • Hi Ali,

    For your question, I want to confirm:
    1. Whether all Outlook client experience this issue?
    2. How about OWA?

    Firstly, you can test it under Outlook cache mode as Gareth mentioned.
    Then, use below blog to test Exchange performance:

    If this issue only occur on Outlook client, please try to remove all other add-ins expect Windows Indexing for testing. More details about troubleshooting Outlook 2007 performance, for your reference:

    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact

    Allen Wang
    TechNet Community Support

    Wednesday, April 20, 2016 5:38 AM
  • Dear Gareth,

    Excuse me for delay as I was on vacation and afterwards busy with other tasks . Our users access outlook from their local PCs .They all are configured with online mode . We don't want to switch to cached mode now.

    Thanks for your suggestion for me very much


    Monday, May 9, 2016 6:18 AM
  • Dear Allen,

    Excuse me for delay ,as I was on vacation & busy with other tasks. I am going to act to the guide for performance check on exchange & let you know the results.

    About users experiencing this delay with OWA ,I have to say that our users don't use OWA while in office and only for missions use it so we have no estimation about it.


    Monday, May 9, 2016 6:22 AM
  • Hey Ali,

    What are the reasons for not using cached mode? It is the preferred method of connectivity. Unless there are security/size concerns.

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    Monday, May 9, 2016 11:14 AM
  • Dear Allen ,

    Our exchange servers are hosted on windows 2003 servers . There was a misunderstanding regarding this matter. Could you please provide me with the link for exchange 2007 SP3 monitoring under windows 2003 server ?

    Our domain mode is win 2008 native mode but the exchange servers are on win 2003 server.

    Thanks for your kind consideration.

    Saturday, May 14, 2016 9:31 AM
  • Dear Gareth,

    Once we had a failure on our storage while using outlook cache mode  on some clients & those clients lost all their emails . It really does not have any relation BUT my manager don want to give it a try anymore.

    Thanks for your consideration 

    Saturday, May 14, 2016 9:34 AM