Imagine 400,000 repetitions of

ASC.Mail.MainThread - CreateTasks(need 10 tasks).

ASC.Mail.MainThread - No more mailboxes for processing.

ASC.Mail.MainThread - All mailboxes were processed. Go back to timer.

and not one entry about actually sending or receiving mail.

I still don't understand, isn't this an office suite? Why does it matter what's in the logs? Fwiw I don't even know whether my MS Office has logs.

This isn't running Office for yourself, this is running Office 360 for your company. Not by subscribing to Microsoft who runs it for you, running it yourself.

So is your complaint mainly as a scripting API user ?

No, my complaint is in keeping it running for other people, who expect things to keep working over time.