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Is it feasible to attach an E3 license to a AD synchronized user prior to mailbox migration?

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Last Modified: 2018-10-05
Is it feasible to attach an Office 365 license with Exchange selected to a synchronized user prior to migrating his On Prem mailbox?  Will doing so create a second, duplicate mailbox?
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Anthony K O365Messaging Consulting

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This was very helpful. Thank you!
Anthony K O365Messaging Consulting

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it appears that when a user is assigned a license prior to migration and the email service is enabled, a mailbox was created in the Cloud, while the On Prem mailbox was still being used. Not sure why
MaheshArchitect
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Anthony K O365Messaging Consulting

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Excellent. That makes sense!!

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