Exch 2010 Post to Public Folders - 'From' field grayed out

Using Exchange 2010 and Outlook 2010.  I would like to post to Public Folders as another user but when I click 'Options' the 'From' field is grayed out.  How can I enable this?  I would you like to use one Outlook profile instead of logging in as another user entirely just to post.

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jkimzlgAsked:
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imkotteesSenior Messaging EngineerCommented:
Hi,

From field is only available for an email, not for the Post.

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