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the migration of our email to Office 365 the OIT Infrastructure team is enabling a policy that will automatically configure all Microsoft Outlook 2010/2013 clients in 'Cached Exchange Mode' to follow Microsoft's best practices. This will provide a much better experience
when using the Outlook client.
If your Outlook client is already configured to use 'Cached Exchange Mode', this change will not impact you. If your client is not correctly configured, you will see a prompt stating "The administrator has made a change that requires you to restart Outlook" asking you to click OK. This message will continue to pop-up until you click OK, so please click OK to restart your Outlook client at which point it will be reconfigured to reflect the changes made. (See screen-shot below)
Note: This is expected behavior; restarting Outlook will resolve this message and engage 'Cached Exchange Mode'
You can adjust how much data is stored locally on your computer, by default cached mode will store up to one-year of email on your computer. In some cases this maybe too much depending on your device (tablets with small hard drives especially) and storage availability. To adjust this setting follow the steps below.
the File tab
Account Settings, and then click Account Settings.
the E-mail tab, click the Exchange account, and then click Change.
Offline Settings, use
the slider to choose how much data you would like Outlook to store. Note: This only pertains to Outlook 2013.
Older emails will still be available when you need access to them, you can click on the box at the bottom of your current folder view that states 'There are more items in this folder on the server' to see your older emails. See the screen-shot below for an example.
URL for configuring Cached Exchange Mode