If you have an OST file that you can no longer open and you're worried about losing your emails, there is an easy solution. I recently had an offline OST file that contained years of important emails, attachments, contacts, and calendars. Instead of trying complicated manual methods, I used the
Aryson OST to PST Converter, and the conversion was completed without any data loss. The software is very simple to use. First, add the OST file, then preview the mailbox, choose PST as the output format, and start the conversion. It keeps the original folder hierarchy, email formatting, attachments, metadata, and mailbox properties exactly as they were in the source file. One feature I found useful is the preview option. Before exporting, I could check emails, contacts, calendars, tasks, notes, attachments, and message details. This helped me confirm that everything was available before starting the conversion. The software is also capable of handling inaccessible, orphaned, offline, and damaged OST files. It does not require Microsoft Outlook or an Exchange Server, making it useful when Outlook cannot open the mailbox. Besides PST, it supports
exporting OST files to PST and many other formats like MBOX, EML, MSG, PDF, CSV, HTML, DOCX, ICS, VCF, and JSON. It can also migrate mailbox data directly to Microsoft 365, Office 365, Gmail, Google Workspace, Thunderbird, IMAP servers, Yahoo Mail, AOL Mail, and Outlook.com. Additional features include batch conversion of multiple OST files, date-based filtering, duplicate email removal, custom folder naming, splitting large PST files, and the ability to skip previously exported items. These options save time, especially when working with large Outlook mailboxes. The software processes everything locally, so your mailbox data stays secure throughout the conversion. Even very large OST files can be converted without size limitations. The free demo version lets you export up to 50 items per folder, allowing you to test the conversion before purchasing the full version.
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