How do I change the default "from" address - Outlook 2010?

How do I change the default "from" address when write new mail in Outlook 2010?

Default address - user's mailbox
Secound address - shared mailbox

Default address - shared mailbox
Secound address - user's mailbox

Exchange 2013
Daniel HmmAsked:
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Michael MachieIT SupervisorCommented:
you won't be able to set a shared mailbox address as the default FROM address - the default address will always populate as the primary address for the User. The method to make this change is to use the provided drop-down to select the alt. email. You will need either 'Full Access' or 'Send As' permissions for that shared mailbox.

Open a NEW email and see below to use these options to see the 'FROM' drop-down:

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Michael MachieIT SupervisorCommented:
The answer explaining this is as-designed and a screen shot was provided to show how to work around this  to obtain a similar result.
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