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Assuming you're asking whether users with permissions to access a mailbox as a "secondary mailbox" will retain these rights following the migration, the short answer is yes.
However, you will need to test your migration tools and methodology against this scenario in a lab prior to performing the migration in production. There are many migration solutions on the market and each has its own nuances.
Do you have comments on this Ask the Expert Q&A? Let us know.
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