The Quick Solution to fix the ‘Outlook slow to Open attachments’ error is only SysInspire PST Converter software. To fix any error in Outlook, download this tool. You can repair your corrupted PST file and convert them into EML, EMLX, MSG, MBOX, ZIMBRA, ICS, and VCF, etc. Before the conversion, it shows you a live preview of mailbox items like email, contacts, calendar, and journal, etc. The demo version of this software is also available for free.