VB6 Outlook Add-in works in Outlook 2013 but only

Question

I have a VB6 Outlook add-in. This is tested and working on a Windows 7 64bit machine, with 32bit OFFICE installed.

On another PC, Windows 7 64bit, 32bit OUTLOOK install, the add-in does not load. It is not listed in the list of COM add-ins, and when I try to add it to that list manually, it does not appear!

I assume that there is some dependancy with some office DLLs causing the issue but I don't know how to troubleshoot to find out where the issue lies.

Can anyone give me any tips??

Thanks in advance!

Answer 1

I got exactly the same problem until I realized the problem was coming from C:\Program Files (x86)\Common Files\DESIGNER\MSADDNDR.DLL, that is brought by Office 2013 Pro with a file modified in 2010, and not with the family version. Check out http://blogs.msdn.com/b/vsod/archive/2012/11/21/vb6-based-add-ins-may-fail-to-work-on-office-2013.aspx and http://support.microsoft.com/kb/2792179 that mention this issue. Another important thing to note that that the Family edition looks to be a ClickToRun version (simili AppV virtualized application and Professional version is a fully installed version).