How to Configure Outlook for Windows for Office 365
https://uit.stanford.edu/service/office365/configure/outlook_windows
Apr 20, 2020 · Email, calendar, and other items are kept in an Outlook data file on your computer so you can work offline. You can set the duration of this setting to 1, 3, 6, 12, or 24 months, or All. In Outlook, click the File menu. Click Account Settings > Account Settings. In the Account Settings dialog box, with the E-mail tab selected, click Change.
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