Why do some email records have no MessageID value?

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Hi Guys,

I’m writing an email sync program, I intend to use messageid as the unique identifier for the source mailbox and the email record in Dynamics CRM. But I found that not all email records have a value of messageid.

Because my this program is a supplement for dynamics email OOB, so if not all email records have messageid value, then I won’t be able to determine if an email has actually been synchronized.

I would like to know which value in Dynamics CRM is the source mailbox also exists and can be used as a unique identifier between them.

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