Can't open default outlook email folders, missing .ost file backup
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2017-10-20 13:36:46 UTC
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Is your outlook not accessing default ost folder emails ,so there may be reason behind it such as corruption ,deletion ,etc .

I would like suggest a solution that is https://medium.com/@romantrump/100-verified-atom-techsoft-outlook-ost-to-pst-software-946a1cf60e21

download outlook ost file recovery software from this article site and install it on your system for ost file recovery .

This software is advance and satisfied solution for accessing ost default folders .Because if ost file corrupted then outlook do not access file .So for accessing corrupted ost file into outlook ,you have need of good and well guideline provider tool .So choose this above solution and recover ost file data and convert ost into outlook pst file and as well as access whole of your ost default folder .
2017-11-16 09:58:05 UTC
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Use OST to PST Converter​ program has great capability to retrieve all damage OST emails with whole email properties and convert OST emails into other four different formats MSG, EML, PST and HTML file format. for more details please visit http://www.completeconverter.com/ost-to-pst-converter
2018-01-10 05:05:14 UTC
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When the server crashes, these are emergency files that can be used in the offline mode. This acts as the best backup OST files. In this way, Convert OST to PST tool helps the user in all critical situations which proves to be the flawless solution. Download free trial version to get the preview of your convertible emails : http://www.recoverfilesdata.com/ost-pst-conversion.html