As MS Office is not an Apple product, and there are not as many Office users active here as one would think, I believe you will be better served by asking in Microsoft's Office forums. MS Office questions posted in these forums tend to linger a long time before getting any kind of helpful response.

MS made their forums less user-friendly than before by making it harder to limit answers to Mac subjects, but it can be done when you know the trick, Start here: 

Results in Office - Microsoft Community.

That will display this page header:

1) Use the “Office Topic” pull-down to select your Office app (Outlook).

2) Limit answers to Mac topics with the “Office Sub-topic” pull-down.

3) If needed, use the “Show Filters” option to further narrow the results.

Everyone there is both and Office user and a Mac user, something you can't say about Apple's forums. I believe you will find the contributors there knowledgeable and very helpful.