Information about SharePoint Online guest platform migration behavior
Consider the following example for the Contoso tenant:
A member of the Contoso tenant (contoso.onmicrosoft.com) issued an invitation to a guest user from Fabrikam: firstname.lastname@example.org. Notice that the invitation was accepted in the year 2014.
AcceptedOn (1): 2014-12-15T17:30:40Z
CreatedOn (1): 2014-12-15T17:30:40Z
CreationType (1): Invitation 
UserState (1): Accepted 
UserType (1): Guest 
Imagine that the SharePoint guest migration process for contoso.onmicrosoft.com occurred on July 25, 2016. An administrator might notice that email@example.com was created as a guest on that date, almost one and a half years after the latest invitation was accepted by firstname.lastname@example.org. The entry would be displayed as follows:
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Article ID: 3185002 - Last Review: 08/17/2016 16:55:00 - Revision: 5.0
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