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>log in to comment- joseph· 3mo ago
I was trying to move my old Outlook mailbox to Zimbra, but my OST file was not directly usable there. I had important emails and attachments, so I didn’t want to take any risk with manual methods. After searching for a solution, I used this converter and the process went better than expected. It converted my mailbox data properly and kept the folder structure intact. It made the whole migration task much simpler.
Softaken OST to TGZ Converter exports Outlook OST mailboxes to Zimbra TGZ archives without needing Outlook or Zimbra installed.
- for
- IT admins and users needing to migrate Outlook OST data to Zimbra.
- pricing
- freemium · free trial
Key features
- Standalone conversion — Converts OST files to TGZ without installing Outlook, Exchange or Zimbra.
- Batch and multiple OST support — Import multiple OST files at once via folder option and process them together.
- Selective export & date filter — Choose specific folders or date ranges to export only needed items.
- Preserves folder hierarchy — Maintains original Outlook folder structure, subfolders and email metadata.
- Full data export — Exports emails, contacts, calendars, notes, journals and attachments.
- Preview mailbox — Shows complete OST mailbox contents before conversion.
Use cases
- Migrate an entire Outlook mailbox to Zimbra Desktop for a company migration
- Export only calendar items from an OST file to Zimbra using date range filter
- Batch convert multiple archived OST files to TGZ for backup or archival purposes
Softaken OST to TGZ Converter vs alternatives
 Softaken OST to TGZ Converter |  Softaken Zimbra Converter | |
|---|---|---|
| Best for | Standalone OST-to-Zimbra TGZ conversion | Zimbra TGZ to other formats |
| Pricing | Freemium | One time fee |
| DevHunt upvotes | 0 | 0 |
| Launched | Jan 2026 | Jan 2026 |
- Softaken OST to TGZ Converter vs Softaken Zimbra Converter: Converts Zimbra TGZ files to other formats, opposite direction of OST-to-TGZ
Softaken OST to TGZ Converter FAQ
Do I need Outlook or Zimbra installed to use the converter?+
No. The tool runs as a standalone Windows utility and does not require Outlook, Exchange Server, or Zimbra.
Can I convert corrupted or orphaned OST files?+
Yes. The converter includes recovery/deep-scan options to extract available data from damaged OST files before exporting.
What items are exported to the TGZ file?+
Emails, contacts, calendars, notes, journals, attachments and the full folder hierarchy are included in the TGZ archive.
Is there any file size limit for conversion?+
The software has been tested with any size OST file and imposes no file size constraints.
How do I import the generated TGZ into Zimbra?+
Import the TGZ via Zimbra Desktop’s Import menu or Zimbra Collaboration Suite’s Preferences > Import/Export workflow.
Summarized by DevHunt from softaken.com · Sep 28, 2026. Details may change; check the official site.
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