We are migrating a Public Folder and receive the following errors.
Error: "An internal server error occurred. The operation failed"
Migration stopped due to too many errors. Mailbox Interrupted.
Increase storage limits in the target environment so migration won't exceed the mailbox limitations set by Microsoft.
Please review this Microsoft article: https://docs.microsoft.com/en-us/office365/servicedescriptions/exchange-online-service-description/exchange-online-limits#mailbox-storage-limits