Cached Exchange Mode in Microsoft Outlook

35 pts.
.OST files
Exchange monitoring and logging
Microsoft Exchange
Microsoft Outlook
I'm new to Exchange and I have read that Microsoft Outlook opens/performs faster in non cached exchange mode rather than in cached exchange mode. Is there a reason for this? I understand the initial setup of the .ost file can take awhile if you have a large mailbox but after that, is there a difference in terms of performance?

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Default is on for mailbox and off for public folder favorites. The main disadvantage of Cached mode is that changes are not propagated to the server immediately. Any user on an exchange server that have to dial-in into a network to retrieve e-mail should not use cached exchange mode, as it will run slower.

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  • Sixball
    Like Rechil mentioned, cached has to go through more processing than non-cached, thus the delay in using it with Outlook...
    8,705 pointsBadges:
  • ITAddict
    The only advantage to cached exchange mode is for someone that wants to read their e-mail off-line. Turning off cached exchange mode shows your e-mail from the server. No downloading to an .ost file is required. I turn off cached exchange mode on local desktops and new e-mail is instantaneous.
    875 pointsBadges:
  • IceCubbe
    Yup like mentioned the main advantage of cached mode is to use outlook offline, if you require users to use it offline then turn it on, if not turn off.
    1,385 pointsBadges:
  • Julie178
    Microsoft Outlook 2003 and newer versions introduce a new feature called Cached Exchange Mode, which is actually an improved version of offline folders in Outlook older versions. Cached Exchange Mode provides many functions to make the synchronization and offline operations efficiently and conveniently. One of them is Exchange Recovery Mode. you will see the following warning message when your Exchange mailbox is reset or inconsistent: "Exchange is currently in recovery mode. You can either connect to your Exchange server using the network, work offline, or cancel this logon." which indicates Outlook and Exchange are currently in Exchange Recovery Mode. You may visit: to know more about cached exchange mode. Julie
    125 pointsBadges:

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