Are you looking for a solution to backup offline Outlook data file .ost to desktop and cloud apps? If yes, then try all-in-one OST Converter software. It is one of the best converter tools to backup offline Outlook data file .ost format to PST, PDF, MSG, EML, MBOX, Office 365, Exchange Server, Yahoo Mail, IMAP, and many other. It is a very simple GUI, both technical and non-technical users can easily handle and use the software without any technical expert’s help. It supports all the MS Outlook versions like 2019, 2016, 2013, and etc. It allows batch backup offline Outlook data file .ost to desired file format without any problem. It converts all emails, contacts, calendars, tasks, notes, etc. from OST to desired format.