We are having the same issue with two of our clients using our email, not Microsoft's email. There have been several little "bugs" over the last year or so where our clients have had issues using Outlook with our email service. It's really beginning to seem that Microsoft is making it harder for people to use Outlook without using Microsoft email. We have begun to urge our clients to switch to eM Client vs Outlook. We use eM Client in our office flawlessly. The "New" Outlook won't even let us connect using EAS. Microsoft seems to be silent on this thread lately. None of the "fixes" that have been suggested by Microsoft alleviate the problem. Constantly asking for a password, and when we enter it, it just doesn't connect, it asks for it again. It's so frustrating because we have clients that have used Outlook for years and they don't want to switch. But Microsoft is throwing roadblock after roadblock.