There are many automated and manual solutions available to convert OST files to PST, but one of the most effective methods is using the MSOutlookHelp OST to PST Converter. With the help of this tool, you can import OST files into various other email clients such as IMAP Server, Gmail, Google Workspace Account, Outlook.com, AOL, Zoho, and Yahoo Mail. The tool offers multiple features like Convert OST without Duplicate which allows converting OST files to another format without duplicates, you just need to choose the "Save Email without Duplicate" option and proceed with the process then will get the resultant file without any duplicate items.