No, you can't. It uses the default task list.

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Diane Poremsky [MVP - Outlook]
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> is there any way to get another uses task list in the to do bar in outlook
> 2007
> as we use other users task lists with multiple calendars.
>
> the order you selected the calendars in outlook 2003 determind what task
> list was visable in the calendar task pane.
John Bland - 30 Oct 2007 09:42 GMT
so any way of making another users task list your default ?
> No, you can't. It uses the default task list.
>
[quoted text clipped - 4 lines]
> > the order you selected the calendars in outlook 2003 determind what task
> > list was visable in the calendar task pane.
Brian Tillman - 30 Oct 2007 13:28 GMT
> so any way of making another users task list your default ?
Nope.

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Brian Tillman [MVP-Outlook]