OutlookVim 8 and Outlook 2007: "Please install the plugin OutlookVim from www.vim.org to continue"

I just downloaded and installed OutlookVim version 8 for use with
Outlook 2007 running on a Windows XP system. I followed the
instructions for installing the macro to step 12, the last sub-step
for Outlook 2007: "Click on the new button in the Quick Access
Toolbar". The result is a pop-up window titled "Microsoft Office
Outlook" and containing the message:

OutlookVim: Please install the plugin OutlookVim from
www.vim.org to continue

I found that this message is displayed by OutlookVim.bas if

exists('g:loaded_outlook')

is false. But, I can open gvim from its Desktop icon, execute
that command and see that it returns 1.

I found the Wiki page that discusses this error. It suggests that
the files are installed in the wrong locations. Mine are here:

~/vimfiles/plugin/OutlookVim.bas
~/vimfiles/plugin/outlook.vim
~/vimfiles/plugin/outlookvim.js

I tried putting outlook.vim in C:\Program Files\vim\vimfiles\plugin
in case gvim couldn't find my $HOME. No difference.

I am running Vim 7.3.762.

What can I do to fix this or to troubleshoot it?

Regards,
Gary

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