30 Nov 2020 Ost = Outlook ofline folder. PST = Outlook data file. PKG = a mac installation file iso = an image file for Windows, for example.. Associate OST Default Program on MacOs Click *.OST (e.g example. In the programs list, click Microsoft Microsoft Outlook program Or other appropriate program.... pst files are used to store archived items and the .ost files to maintain off-line availability of the items. This is an essential feature of Microsoft Outlook. 63b95dad73 ellephi
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