I would highly recommend that you first start by creating a profile
for outlook, that way the UAI changes only apply to outlook.
From the NVDA menu select: Configuration profiles.
You could either create a manual profile so you can turn on UAI only
when desired. Or you could set it as an automatic profile )assuming
you opened the NVDA menu while Outlook was the focused application)



You can enable UAI in the NVDA settings.

preferences -> settings -> advanced
Read the warning and check the box to say you understand the risk

Go to the "Microsoft UI Automation" section
I turned on:

1. Enable selective registration for UI Automation events and property changes
2. Use UI Automation to access Microsoft Word document controls when available