Send as other mailbox in Outlook 2007/Exchange 2010

I have added full access and send as permissions to a user in Exchange 2010.
The client is using Outlook 2007.

When the client next opens outlook, the additonal mailboxes appear.
However they cannot select which mailbox to send from.

How do you make the "From" field appear in Outlook 2007?
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StrongBad_RulesConnect With a Mentor Commented:
Open a new message, click on the options ribbon.  Click the show from button.
MayogroupAuthor Commented:
That easy hey! Thanks for that.
Anyway I can make it default to the users main mailbox so they don't have to enter their mailbox each time for the 99% of the emails they send normally?
You can also sending from "addtional mailbox" using OWA. The user must log using their personal credential. To log thru OWA.
MayogroupAuthor Commented:
Next issue. If a user sends an email from thier second mailbox, how do I make the sent items store in the 2nd mailboxes sent items folder?
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