We have one user out of our entire organization that gets the attached pop-up message when she opens Outlook. She is able to simply click "OK" and all can use her email just like everyone else, but this pop-up continues to occur. It has happened for years apparently and doesn't matter what computer or version of Office is installed, the pop-up remains.
We have tried doing everything possible troubleshooting locally but the simple fact that it appears on multiple computers rules that out as a solution. We have a hybrid setup for Office 365 and nobody out of our 500 users receive this message outside of herself. We believe the issue is somewhere on the administrator side of Exchange/Office 365 but we are unsure where since everyone isn't affected. Our next step is to call Microsoft but wanted to try Experts Exchange as a last resort.