Greg Taylor - EXCHANGE I don't think so because I just deleted the Outlook profile, tried to recreate it, and it started prompting for credentials using the Basic Authentication screen. I know it is going to fail at that point. Also, there is only one other user that has this issue. It isn't affecting everyone like it is affecting these two users. The current Exchange Online incident that just came out today sounds very similar to what I am experiencing with these two accounts, but these users don't have multiple accounts. This is issue is really mind blowing because it isn't affecting everyone the same. I can log into this same PC with a different E1 licensed user and Outlook works fine, so why it is happening for these 2 users is beyond me. If I migrate her back to the On-Prem server, it works fine.