I suggest that you download eSoftTools OST to PST Converter Software to Import Outlook OST to IMAP. This software splits the large PST file into a small PST file and also presents you with a free demo to save the 25 file items from each and every folder of the OST Mailbox. This software is easy to operate for technical and non-technical users and It supports all types of Windows OS and MS Outlook versions, 2010, 2019, 2007, 2013, 2016, and 2003.
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