To convert offline OST to PST in Outlook, it’s important to understand that Outlook itself cannot open an offline or orphaned OST file unless it is connected to the original Exchange profile. If the Exchange server is unavailable, the profile is deleted, or the OST file is disconnected, the manual export option in Outlook will not work.

In this situation, the practical way to convert offline OST to PST is by using a standalone conversion tool. A utility like SysInfo OST to PST Converter can open offline or orphaned OST files without requiring Outlook or Exchange connectivity. The software scans the OST file, displays a preview of mailbox items (emails, contacts, calendars, tasks, notes, and attachments), and allows you to export everything into PST format safely.
Read more: https://www.sysinfotools.com/ost-to-pst-converter.php

Easily export your offline OST data to Outlook PST format using the powerful GoldyTools OST to PST Converter for Mac. This smart solution not only converts OST files but also recovers data from corrupted or inaccessible OST files with precision.

GoldyTools OST to PST Converter for Mac efficiently migrates all mailbox components—including Inbox, Sent Items, Drafts, Attachments, Calendars, Contacts, and more—from OST to PST format, ensuring complete data integrity.

The software is fully compatible with all versions of macOS and Windows, making it a versatile choice for users across platforms.

✅ Key Features:

Converts OST to PST with all email items intact

Supports recovery of damaged or corrupt OST files

Preserves folder structure and metadata

Compatible with Mac OS and Windows OS

Easy-to-use interface for beginners and professionals alike

Free demo version available for download

🔽 Try Before You Buy:
Download the free trial version to evaluate the software. Convert and preview a limited number of items before purchasing the full version for unlimited access.
https://www.goldytools.com/blog/high-security-ost-to-pst-converter-for-ost-to-pst/