outlook 16.22.0 on macOS mojave
unable to open outlook 16.22.0 on macOS mojave
suspect bad attachment
iMac Pro
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Welcome!
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.
Results in Office - Microsoft Community
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:
Use the Sub-Topics pull-down to limit answers to Macs, and 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.