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MessageID versus UniqueID (C# .NET)

Using POP3 Client: what is the difference between MessageID and UniqueID when retrieving an email? I did not find a discription.

@sdsaug,

Actually, UniqueID is identifier which is used to performs different operations in Pop3 client. MessageID cant be used for this purposes. UniqueID is identifier depended on the protocol. MessageID is protocol independent identifier.