You want to Convert OST to EMLX. You can try the Convert OST file Tool is an easy way to Migrate OST files to PST file format. This software is export OST data files to Multiple file formats like - PST, MBOX, MSG, EML, EMLX, and VCF files format. It is
export the OST file item such as email, contact, Taska, calendars, Attachments, etc. This utility shows the preview before the conversion. Supports all Windows OS and MS Outlook versions. Install the free demo version of the application before Purchasing.
For more info visit here:-
https://www.mailsclick.com/convert-ost-file/
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