You can fix the error of ’The set of folders can’t be opened in Outlook’ and any other error by using the SysInspire PST Converter software. With this software, you can repair pst file that has been corrupted. It extracts the corrupted pst into many other formats including EML, EMLX, MSG, HTML, MBOX, ZIMBRA, ICS, and, etc. Whenever it starts extraction of pst file, before that it shows you a live-preview of mailbox items. The demo version is also available.
Get more:- ’The set of folders can’t be opened in Outlook’ error fixed