The email service of Microsoft was hit by a Y2K22 bug that clogged up Exchange servers, which prevented users from accessing their inbox.
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There was a problem with the naming convention, which broke the functionality. The update 220101001 deployed exceeded the arbitrary limit of 2147483647, which became a failure.
Not to do with malware scanning
“The problem relates to a date check failure with the change of the new year and it is not a failure of the AV engine itself. This is not an issue with malware scanning or the malware engine, and it is not a security-related issue. The version checking performed against the signature file causing the malware engine to crash, resulting in messages being stuck in transport queues”, said Microsoft on its support page.
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The solutions provided by the company can be automatically done or manually, as prescribed in the Microsoft support page.
“We have now created a solution to address the problem of messages stuck in transport queues on Exchange Server 2016 and Exchange Server 2019 because of a latent date issue in a signature file used by the malware scanning engine within Exchange Server”, Microsoft said on its support page.