10 hours ago
To repair a corrupt OST file, first try deleting the OST file and let Outlook automatically recreate it by syncing with the Exchange server. If that doesn't work or the file is orphaned, use the ScanPST.exe tool provided by Microsoft to scan and fix minor issues. For severely damaged or inaccessible OST files, it's best to use a professional OST repair tool like MailVita Converter for OST, which can safely scan, repair, and recover all mailbox items, then export them to a healthy PST file for use in Outlook. Refer: https://www.mailvita.com/converter-for-ost/