There are several causes for Outlook offline OST files to get missing, damaged, or deleted. Additionally, utilize the built-in utility to fix any faults, damages, or corruption first. You can use this to fix corrupted or damaged Outlook OST files for all Outlook versions such as- 2003, 2007, 2010, 2013, 2016, 2019, and 2021. Although it has been found that this utility usually avoids the problem. Use the third-party, premium Outlook OST Repair Tool in this situation. The use To recover your OST files,  the Softaken Outlook OST Recovery Tool. This is an effective way to automatically fix various errors, and damaged, and corrupted Outlook OST files. All users can utilize this application's user-friendly interface. ANSI and UNICODE file types are also supported.

Use OST To PST Converter is the most efficient tool when it comes to converting OST files to PST format. This utility is loaded with a comprehensive set of advanced features, designed to cater to the needs of even the most tech-savvy users. Moreover, it offers the flexibility to convert OST files into various file formats and seamlessly integrates with multiple email clients. Its user-friendly graphical interface simplifies the conversion process, making it accessible even to non-technical users. Additionally, it guarantees compatibility across all Windows operating system versions. To experience its performance and capabilities firsthand, you can start by exploring the trial versions of the software.

Try the ToolsCrunch Mac OST to PST Converter Tool is an easy method to fix the error OST file missing Outlook 2016. You can also recover your corrupted Exchange OST files. This software export OST data file such as Emails, Inboxes, sent items, deletes an object, drafts, tasks, notes, and attachments. Users can migrate the large OST files into PST file format. Without wasting your time this application is a fast and safe conversion. It shows the preview of the whole OST files before the conversion. All Mac OS versions are supported by this tool, including 10.15 "Catalina," 10.14 "Mojave," 10.13 "High Sierra," and 10.12 "Sierra." Additionally, it supports all Windows OS and MS Outlook versions.

For more details, visit here: - https://www.toolscrunch.com/mac-ost-to-pst-converter.html

MailsDaddy OST to PST Converter is great a tool to convert OST file data into Outlook PST format. It can easily recover all offline & inaccessible OST files components and convert them into Outlook PST format, such as- email, contacts, calendars, tasks, notes etc. This software is compatible to move OST files into PST, EML, MSG, EMLX, HTML and RTF formats.
It also saves Contacts and Calendars to .vcf and .ics formats respectively. Here users can load multiple OST files at a time for PST migration without any alteration. It can show the preview of all OST file database in the preview port. Users can confidently export selected OST file into PST format. It can also support all MS Outlook like: 2003, 2007, 2010, 2013, 2016, 2019, and others.
To download the free demo, visit MailsDaddy site.

To fix the error OST file missing Outlook 2016 you can try to sync the OST file again because the error can be occurred because of OST damage. You can repair it by using OST Converter you resolve the OST file problem and re-sync in the Outlook 2016 account. To know more visit: https://www.sametools.com/convert/ost/

Don't panic, I would like to refer more effective professional tool Regain OST Recovery Tool. With the help of this tool easy to resolve all types critical issues. https://www.regainsoftware.com/ost-recovery.html