Take the best advantage of the new vMail OST to PST Converter for Mac & Windows OS - a reliable and perfect solution to directly convert OST to PST without Outlook. It allows you to batch convert Outlook .ost files to PST file format including all emails, contacts, calendars, tasks, etc. along with attachments. There are no file size limitations, you can convert a large-size OST data file into PST format without any data loss. This software also supports various file formats such as; PST MBOX, EML, MSG, Office 365, Gmail, G Suite, Exchange Server, etc. You can also download the free demo version of the software and convert the first 30 items without any cost.
Know more info-https://www.vsoftware.org/ost-to-pst-converter.html