Outlook on Mac Says "Bad Username or Password"

There are two Macs in an area of our library equipped with Microsoft Outlook. One of them currently gives a "Bad Username or Password" area when an attempt to check the user's email is made; Outlook is working properly on the other. I checked to ensure the Outlook settings were the same on both machines.

The user with the troubled Mac remotes in to a Windows 7 desktop that also has Outlook with an email account set up for her. On it, things worked fine; she's also able to log into webmail without error. That tells me something is borked with her email setup.

I tried deleting & recreating her email account on her Mac; that failed to fix the issue, though.

Any input would be appreciated.
Wesley JohnsonIT AssistantAsked:
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Wesley JohnsonConnect With a Mentor IT AssistantAuthor Commented:
I updated the client. This seems to have done the trick.
Wesley JohnsonIT AssistantAuthor Commented:
This is connecting with an off-site Exchange server.
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