Outlook 2016 doesn't accept password or app password

Nine have released a 'fixed' version that seems to resolve the problem of Microsoft no longer accepting Base64 encoded text. Seems to work. I have asked Nine Support whether that means data is now sent as clear / plain text and to confirm that username/password are NOT sent as plain text. Awaiting their response.

I've also asked them to confirm I don't need to do anything in respect of my previous paid-for registration since I had to uninstall and reinstall and got the two week trial message when I did so.

Just remove the account from Nine Folders and add it back in again after patching the app.

(Sorry for the delay in responding. I've been out all day and funnily enough my Microsoft email isn't updating right now!) :-D

Outlook is MS's product, so they can do with it what they please. With so many users utilizing a robust email server that not only includes email syncing, but calendar, tasks, notes, etc. it make me wonder why MS has not come up with as robust a product, or purchased one of the existing products. Yes, MS offers Outlook and not the .com one, which is in fact a very robust email server for the desk top. Today, we're much more mobile, and the Outlook app for mobile leaves SO MUCH to be desired. If they took their desktop product and made it mobile, they'd probably be able to garner a good share of the market. Whether you like MS or not, we're left with this ecosystem that forces us (and I currently love my 9Folders email for android) to use third party apps, which then, due to MS, have all these issues.

Report at Down Detector by clicking on "Outlook" here:

https://downdetector.com/status/microsoft-365/

And why is this hit or miss (intermittent)? I can go for periods in a day, where it's working and then out of the blue, it's gone.

That's not surprising especially if there is a scramble to reroute resources, recover servers or otherwise triage the system. Previous references to the type of authentication and encryption and the fact that Microsoft is coincidentally(?) making changes to the Outlook ecosystem this month leave me concerned that this is a proprietary grab which Microsoft accidentally let out of the bag too early, wherein they plan to force people to use only proprietary products in which configurations cannot be changed or even reviewed as is the case with the Outlook android app.