When sharing a calendar it appears that only the 'Show As' status is posted;
can the choices 'Busy', 'Tentative', 'Free', 'Out of Office' be changed or
expanded?

No, that is hardcoded.

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Diane Poremsky [MVP - Outlook]
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"VA7RMM" <(E-Mail Removed)> wrote in message
news:B9EE081E-C076-47C6-BD6A-(E-Mail Removed)...
> When sharing a calendar it appears that only the 'Show As' status is
> posted;
> can the choices 'Busy', 'Tentative', 'Free', 'Out of Office' be changed or
> expanded?