As far as creating an addin that operates in Excel, no you don't. If you
use controls that need licenses or something like that, then you would, but
not for Excel. Each User of the addin would need to own a licensed copy of
excel.

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Regards,
Tom Ogilvy


Excel4Engineer wrote in message
...
I am trying to develop some Excel Add-in for sale, do i need any licence
or permission from Microsoft?
Thank your very much for your help.

Excel4Enginner
Easy, Fast and Simple Data Processing
Houston, Texas