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In classic Outlook, select File > Options > Calendar.
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Under Calendar options, select the Default reminders check box, and then select the amount of time you want to set for getting a reminder before your meetings.
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Select OK.
To set a reminder for a specific meeting, see Set a meeting reminder.
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In Outlook for Mac, go to Outlook and choose Settings, or press ⌘+, (comma).
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Select Calendar and choose the amount of time for Default reminder under Calendar options.Â
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Exit Preferences.Â
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In new Outlook​​​​​​​, on the View tab, selectÂ
 View settings. -
Select Calendar > Events and invitations.
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Under Default reminder, select the amount of time you want to set for getting a reminder before your meetings.
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Select Save.