How To change the Outlook Caching Setting in Outlook 2016/Office 365

04/07/2018

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Click the Main office button in the top left on Outlook then account Settings

Outlook 2016/365 Main Menu Account Settings

Then hit Change on the account

Outlook 2016/365 Account Editing Panel

Then change the stored email length,

Outlook 2016/365 Caching Settings Window

For more indepth instructions and more options, Check out Microsoft’s Support Page