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Are you on Outlook 2016 as well?<br />
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I would try wiping the Outlook profile and rebuilding it. Sounds like there might be a problem in her account setup.
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I have done that already. &nbsp; &nbsp;Same problem comes up.
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You're welcome! What fixed it?
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<a href="https://social.technet.microsoft.com/Forums/en-US/8cf3b882-a1a9-4751-89c8-6e9be2ff9b87/public-folders-credentials-prompt-after-migration-to-2013?forum=exchangesvrclients" rel="ugc nofollow">https://social.technet.microsoft.com/Forums/en-US/8cf3b882-a1a9-4751-89c8-6e9be2ff9b87/public-folders-credentials-prompt-after-migration-to-2013?forum=exchangesvrclients</a>
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I have one user that is the author of several Public folder calendars and when she tries to access these calendars she is prompted for her user and password. &nbsp; She can cancel out of it and still do her work but it is strange. &nbsp;Her account is not support to prompt. &nbsp; I can access the folders an I am not prompted for a login. &nbsp;What could be causing this issue?
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I have one user that is the author of several Public folder calendars and when she tries to access these calendars she is prompted for her user and password.   She can cancel out of it and still do her work but it is strange.  Her account is not support to prompt.   I can access the folders an I am not prompted for a login.  What could be causing this issue?

Outlook 2016 and Exchange 2010 and Public folders

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.