Is System Error 66 specific to Microsoft Exchange, or can it occur with other email synchronization protocols?

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Is System Error 66 specific to Microsoft Exchange, or can it occur with other email synchronization protocols?
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While System Error 66 is primarily associated with Microsoft Exchange ActiveSync, similar synchronization errors can occur with other protocols like IMAP or POP3, though they will typically have different error codes. The underlying cause is often a connection failure or authentication problem.