Ahh... I suspected as much.

I am writing in C#. What would be the mechanics to get an Outlook 2007
reference in this scenario? The PIA's can only be installed on a system
with that version of Office, and you can only have one version of Outlook
installed at a time (if I understand correctly). Would I need two
development environments; one with Office 2003 to create the add-in using
the Outlook 2003 PIA and another with Office 2007 to change the reference?

If I didn't take this unsupported approach, would I instead have to refactor
my code into two add-ins (with a lot of common code), build each on
different build machines, and install the appropriate one based on the
version of Outlook installed?

Michael

"Ken Slovak - [MVP - Outlook]" wrote in message
...
It's completely unsupported, but if you set up for an Outlook 2003 VSTO
2005 SE addin and use the Outlook 2003 PIA and then change the Office
reference to an Office 2007 reference you can do what you want. Of course
you would only be able to support the Outlook 2003 object model using
early binding and could only use late binding for methods and properties
added in Outlook 2007. Outlook 2007 events you couldn't handle at all.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Absolute Beginner's Guide to Microsoft Office Outlook 2003
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm


"Michael" wrote in message
...
I have written an Outlook 2003 shared add-in, and it seems to run pretty
well in Outlook 2007. I am planning on migrating it to VTSO 2005 SE. I'd
like my add-in to run equally well in Outlook 2003 and Outlook 2007.
However, if it's running in Outlook 2007 I'd like to be able to take
advantage of some of the new features, like using RibbonX instead of a
toolbar that's placed on the Add-ins tab on an Inspector window.

Is this possible?

Michael