#1 Stellar OST to PST Converter
Stellar Converter is the best tool to convert inaccessible OST files to Outlook PST files. The tool easily converts all mailbox data like email with attachments, calendar, and contacts to PST files. This tool compatible with all versions of MS Outlook from 2000 to 2019.
It allows for the conversion of encrypted OST files to Outlook PST files. The stellar tool also allows to search specific email messages and save them to MSG, RTF, EML, HTML, or PDF format.
The converter tool split your large PST file into smaller parts. The stellar free & premium version is available on his official website.
#2 ZOOK OST to PST Converter
ZOOK tool allows converting Outlook OST file to PST format along with all mail items, contact, calendar & notes. ZOOK support all MS Outlook version 2019,2016,2013,2010 and older. It also allows to split large outlook files into smaller parts and merge multiple files into one file.
ZOOK Converter does not require any MS Outlook installation in the system. ZOOK keeps all the meta properties like email, subject, sender, receiver, etc.
#3 ATS OST to PST Converter
ATS Converter is a windows software that allows converting the OST file to PST easily. It also helps with the recovery of OST files and converts your all data and message in PST format. ATS software has a feature to allow users to export all data or messages to PST, Outlook365, Exchange, EML, MSG, EMLX, MBOX, ICS, VCF, and HTML format.
ATS tool split large OST files into multiple PST files & also combine multiple OST files into one file. ATS demo version available on his official website.
#4 Shoviv OST To PST Converter
Shoviv Converter is one of the best converters for the convert OST files to PST, EML, and MSG files. This tool also has a feature to migrate OST to Office 365 and Exchange server.
It helps to recover corrupted & inaccessible OST data like email, contact, calendar, etc without any size limitation. This tool helps to preview your OST file and recovered OST items using the preview option. The user can cross-check the OST items & assure them before converting to the file.
Shoviv Converter Split oversized PST file into multiple files based on user requirements.
Shoviv tool is compatible with all Microsoft Outlook versions & Windows operating systems. Shoviv converter provides a free trial that converts 25 files/folder from OST to PST.
KDETools Converter tool converts OST to PST files quickly & recovers the corrupt OST database easily. This tool capable to restore all data from inaccessible or corrupt OST files.
KDETools convertor also repairs OST file & converts ost file to PST, EML, MBOX, MSG, EMLX, HTML, VCard, Live Exchange Server, and Office 365 file types. It converts all mailbox data including emails, calendars, contacts, notes, and other important data. KDE converter also keeps all meta such as: to, cc, time, date, subjects, images, and attachments.
KDETools Converter split the OST file into multiple PST files. It allows previewing recovered OST emails including folder, sub-folder, calendar, etc. This tool has no file size limitation.
KDETools Support all Microsoft Windows & MS Outlook versions.