You can't - reminders, flags ,etc. only work in the default folders that
Outlook creates. You can get a small application written by Outlook MVP Ken
Slovak called Reminder Manager that will give you reminders in non-default
folders. http://www.slovaktech.com

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Milly Staples [MVP - Outlook]
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After furious head scratching, Kikgrrl asked:
| I juggle a lot of different info in our small office, so I have two
| calendars in Outlook. When I try to save appointments with reminders
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| just want Outlook to do what I want it to do, not what I tell it to
| do! Life would be grand if I could have reminders in both calendars.