Outlook for Mac file indexing inconsistent

[Steve Denney]

I'm seeing some inconsistent behavior using FT Personal (Version 6.5b2 build 1866) in indexing / searching Outlook for Mac 2016 (v16.11) messages. 

As you can see from the attached screen shot, there is no longer a selection check box for Outlook under Preferences - Files - Predefined locations. (Outlook used to be a recognized application on that list, but vanished at some point.) I've tried to add the Outlook 2016 data folder as a custom location, but that is a hidden directory, so cannot find a way to navigate to select it from within the dialog box. My workaround was to select the entire "Library" check box, but that also indexes a lot of system files and garbage that I don't want. Additionally, this workaround seems inconsistent n actually finding and indexing the Outlook email - sometimes those items just vanish from the index. I have experimented with Update Index Entirely and Rebuild Index, and usually can get the Outlook mail to show up in the index again, but it will eventually vanish again. Sometimes I see a different issue, where there are multiple copies of each message in the index!

Any ideas on how I can clean this up? Outlook indexing is one of the primary reasons I use FT. Is there a way to re-add Outlook as a known "predefined location" in the Preferences menu?

Thanks in advance!