Hi Merlin,
Outlook itself doesn't provide an option to achieve this. As you already know, we need to write a macro to achieve this. VBA macros are stored in the user's VbaProject.otm. However, it's not really suppoted to distribute that file to multiple
users although it can be done:
http://www.outlookcode.com/article.aspx?id=28
(Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)
See the following thread for more details:
https://social.msdn.microsoft.com/Forums/office/en-US/c1ded685-09b8-4657-b073-87782b02fc39/deployment-ms-outlook-macros-in-multiple-systems-with-out-using-visual-studio?forum=outlookdev
If you need any assistance when writing the macro, you can post to the Outlook for Developers forum:
https://social.msdn.microsoft.com/Forums/office/en-US/home?forum=outlookdev
Hope this helps.
Regards,
Steve Fan
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