ASKER
ASKER
Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.
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Normally if permission is proper then it should not be any issue with the mailbox. The mailbox is already in O365 so syncing is not an issue.
You can provide full access permission as per your requirement.