Could you please advise is there some method to set for a user who has access to Shared mailbox, that would be able to read mails only without deletion?
In PowerShell the syntax for giving access to a shared mailbox is the follow one, but this does not contain some read only kind of possibility:
Add-MailboxPermission "TestMailbox" -User IT\R.Smith -AccessRights fullaccess -InheritanceType all
I am aware of another syntax too:
Add-MailboxPermission -Identity "TestMailbox" -User IT\R.Smith -AccessRights ReadPermission
but this is some other permission related as tested and sure still allows the mail deletion, inspite of sounding to some read kind of permission