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Is it possible to restore Exchange Online mailboxes to on-premise Exchange server?

Hello @Lubos Dvorak 

Yes this is possible. If you are leveraging the mailbox agent it supports a hybrid config so you can configure it for access to both onprem and online mailboxes and any combination. You can restore onprem->online or vice versa.

You would simply have to configure it for both so that it can discovery and browse the mailboxes.

https://documentation.commvault.com/11.24/expert/92827_exchange_mailbox_agent_user_mailbox_hybrid_environment.html