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If you want to import OST file to Gmail account, try SysInspire OST to PST converter software. This tool can convert OST file into multiple file format such as OST to PST, EML, EMLX, Yahoo Mail, Zimbra-tgz, vCard, Yahoo Mail, https://www.sysinspire.com/ost-to-pst-converter/. It has a demo version that can allow users to convert items from each folder. It can support all versions of Windows OS. It has a technical support all users can get help by mail or live chat. It has PST splitting feature users can split PST file into multiple small sizes.
Read More: Import OST file to Gmail account