Hi @Yoni ,
According to my research, currently, you can open .pst files, read e-mails in .pst files, and search .pst files for emails.
To see if PST support is available in your copy of new Outlook, go to Settings > General > Outlook Data Files. It should be available to Microsoft 365 software subscribers who have joined the Insider program for Office.
More details, see: Open and find items in an Outlook Data File (.pst)

Besides, I suggest keeping an eye on the Microsoft 365 Roadmap | Microsoft 365
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