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Scheduling and managing events using Outlook.com calendar
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How can i default all my outlook appts in my calendar to 15 minutes
Scheduling and managing events using Outlook.com calendar
If you set the default scale to 15 min and use a day / week view and either use the new event button or right click on the time slot then choose new appt, yes.
You can't change the default though - so using the new > event button in the mail module will create a 30 min appt, as will double clicking on a time slot in day/week views.