Outlook 2007 Add-in in Outlook 2003
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24-09-2019 - |
Question
Just a quick questions.. I have made an outlook add-in for 2007 version and when I tested it with version 2003 it did not seem to work. Is there any special procedure I need to follow to enable to add-in in Outlook 2003 or it won't work at all? I hope I don't have to create a new one for 2003.
Thanks,
SL
Solution
Assuming that you are referring to an add-in created using VSTO.
When you create an add-in for Office 2007 the referenced Interop Assemblies will be the ones associated with Office 2007 and this is the main reason for your add-in not to work on Office 2003.
One alternative will be to reuse the custom add-in code but build it against Office 2003 Interop assemblies. This will work if you're not using any functionality inherent to Office 2007.
IIRC, a VSTO add-in developed for Office 2003 will possibly work on Office 2007 without change, but never the other way around.