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Thunderbird email not retrieving new mail

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mikeheilman.01
mikeheilman.01
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Today I started getting this message and I can no longer access new mail:

"The RETR command did not succeed. Error retrieving a message. Mail server outlook.office365.com responded: Server Unavailable. 21"

Does anybody know how I can fix this?

128.11.0esr (64-bit) on a MacBook Pro

Today I started getting this message and I can no longer access new mail: "The RETR command did not succeed. Error retrieving a message. Mail server outlook.office365.com responded: Server Unavailable. 21" Does anybody know how I can fix this? 128.11.0esr (64-bit) on a MacBook Pro

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