Cached Exchange Mode – Microsoft Outlook 2010

Microsoft Exchange Server Performance is one of the critical issue which Engineers might have dealt with. Dealing with such issues requires patience and collecting too many data to diagnose the root cause.

Why Exchange Server Behaves sluggish?

What changes might have caused Exchange Server to respond slowly?

This blog post is to understand and enable one of the feature which can help Microsoft Exchange Server to perform the way we expect.

Some companies might follow Online Exchange Mode for Microsoft Outlook Client. Doing so might cause Performance issue at times. Due to the Disk I/O Read/Write operation increasing abnormally which in turn causes Performance issue.

Disk Bottleneck errors are listed when you scan the server using EXBPA.

RPC Dialogue Box message reported by end users while Send/Receive Operation.

Online Mode may help some organization with small size environment, however medium to large scale enterprise has to move to Cached Exchange Mode. This not only improves clients experience, also server responds in a timely manner.

With that said lets move further by Enabling Cached Exchange Mode feature with the help of Active Directory Group Policy.

To enable Outlook Template please follow steps mentioned from 1.2 to 1.10 in my previous blog which is available here.

Doing this will prevent users in creating Online Exchange Mode.

  • Scenario


DC Name : DC1 (2008 R2)

Exchange Server : Microsoft Exchange Server 2010

Outlook : Microsoft Outlook 2010

Lets see how cached mode users will look like


Figure 1.1 : Default settings while setting up Outlook Profile.

In figure 1.1 any users can change the cached mode to online mode. No control on end users.

Now lets force group policy to disable the feature so tat nobody will be able to change this settings.


Figure 1.2 : Microsoft Outlook Template to work with Cached Exchange Mode.

In figure 1.2 we will edit “Use Cached Exchange Mode for new and Existing Outlook Profiles”.


Figure 1.3 : Enabling the “Use Cached Exchange Mode for new and Existing Outlook Profiles”


Figure 1.4 : Command to Force Group Policy.

Run the command on Outlook machine. close and open Outlook.


Figure 1.5 : Options are greyed out.

Once the group policy is enabled none of the users will be able to change the settings.

Moving to cached mode will improve Microsoft Exchange Server performance.

Happy Learning


MSEXCHANGETEAM | Ideas That Clicks

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Comments: 3
  1. satheshwaran

    Cool Blog !!

  2. Sunder

    If one or two users are in Online Mode then its not a problem. If all users are in online mode then it will increase the disk I/O which in turn makes the server too busy.
    I hope that I answered your questions


  3. Baalaji.V.V.A

    if am using a exchange online mode ,then how its affect exchange perfomance

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