Hi @Ondrej
Welcome to our forum!
In Outlook, recovering deleted messages also depends on how you deleted them.
If you can't find an item in the Deleted Items folder, the next place to look is the Recoverable Items folder. This is a hidden folder, and it's the place where items are moved when you do one of the following things:
- Delete an item from the Deleted Items folder.
- Empty the Deleted Items folder.
- Permanently delete an item from the Inbox or from another folder by selecting it and pressing Shift+Delete.
You can try to recover by following these steps:
In Outlook, go to the email folder list and select "Deleted Items". On the Home tab, select Recover Deleted Items from Server. Select the items you want to recover, select Restore Selected Items, and then select OK. More information, see:https://support.microsoft.com/en-gb/office/recover-deleted-items-in-outlook-for-windows-49e81f3c-c8f4-4426-a0b9-c0fd751d48ce
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