In general, “cached mode” should be turned on. The exception is for users who connect to multiple accounts, particularly when calendaring is involved, as this often results in various “oddities”.
In these cases, we recommend leaving cached mode turned on for the person’s main account, but turning it off for the shared folders.
To turn off caches mode for shared folders:
- With Outlook launched, choose File/Info. Click the Account settings button, then select Account Settings….
The Account settings window will be displayed.

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Double-click the account name (username@middlebury.edu) to open the Exchange Account Settings dialogue window.
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Click the More Settings button.
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Click the Advanced tab.
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UN-check the box beside “Download shared folders”. Leave the “Use Cached Exchange Mode” box checked.

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Click the Apply button, then OK.
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Click Next on the Exchange Account Settings, then click Done to complete the process.
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You will need to close Outlook and re-launch it for the changes to take effect.