This guide shows how to convert Zimbra TGZ to PST and move a Zimbra mailbox to Outlook PST using manual and converter paths.
Quick Answer (Recommended)
- < 1GB TGZ: Manual method works (slow).
- > 1-2GB TGZ / metadata matters: Use SysCurve converter.
- Need PST via SysCurve: Classic Outlook must be installed.
Does SysCurve require Outlook to create a PST? (Yes - here is why)
Does SysCurve require Outlook to create a PST file? Yes. SysCurve’s PST export requires Microsoft Outlook (Classic) installed on the same Windows PC. PST is an Outlook data file format. SysCurve uses Outlook-based PST creation for maximum compatibility and fidelity.
No Outlook installed? Use one of these paths
- Convert to EML or MBOX: Use SysCurve to convert the TGZ to EML or MBOX. These formats can be opened in Thunderbird, Apple Mail, or other clients without Outlook.
- Use a different PC: Move your TGZ file to any Windows machine that does have Classic Outlook installed and run the conversion there.
Tip: If you choose EML/MBOX output, SysCurve keeps attachments intact and preserves folder structure for supported clients.
How to export TGZ from Zimbra (Webmail vs Desktop)
Use the export method that matches how you access Zimbra. Webmail and Desktop both generate a TGZ archive, but the menu paths are different.
Zimbra Webmail export
- Sign in to Zimbra Webmail.
- Go to Preferences and open Import/Export.
- Under Export, choose All folders or select specific folders.
- Choose the export type as TGZ.
- Click Export and save the TGZ file.
Zimbra Desktop export
- Open Zimbra Desktop and go to Preferences.
- Select Import/Export.
- Choose All folders or select specific folders.
- Click Export and save the TGZ file.
Admin note: Server-side exports also produce TGZ archives and follow the same conversion steps.
Method comparison: convert Zimbra TGZ to Outlook PST
| Method | Best for | Outlook needed to create PST? | Keeps folder structure? | Risk |
|---|---|---|---|---|
| Manual (TGZ -> EML -> Outlook -> PST) | Small mailbox or single user | Yes (Classic Outlook) | Partial (manual folder setup) | Medium |
| SysCurve Zimbra TGZ to PST Converter | Large mailboxes, multiple users, metadata preservation | Yes (Classic Outlook installed) | Yes | Low |
Note: Outlook is required only for PST output. For EML/MBOX output, Outlook is not required.
Pick the best method: Manual is fine for small, non-critical mailboxes. For large mailboxes or business migrations, use a converter.
Before you start (important)
- Export a fresh TGZ and keep it as your backup.
- Work on a copy and extract it to a local folder (avoid OneDrive or network paths).
- To export PST with SysCurve, install Microsoft Outlook (Classic) on the same Windows PC.
- Allow enough free space (2-3x the TGZ size).
- If this is a team migration, plan an off-peak window.
Classic Outlook vs New Outlook (PST workflows)
Classic Outlook is recommended for PST export and for contacts and calendar items. New Outlook can export PST in some setups, but it has limitations. In New Outlook, contacts and calendar stored inside PST files are not available.
Does SysCurve migrate Zimbra/TGZ or MBOX directly to a hosted mailbox?
No. SysCurve converts Zimbra TGZ to PST/EML/MBOX. If you need to import into a hosted mailbox, create a PST first (requires Classic Outlook) and then import that PST into the target mailbox.
Manual method limitations (what you will lose)
- Dates and metadata can change during drag and drop.
- Folder hierarchy must be created manually in Outlook.
- Large batches can freeze Outlook or skip messages.
Method 1: Manual Zimbra TGZ to PST conversion (TGZ -> EML -> Outlook -> PST)
This method is free but time-consuming. It is best for a small mailbox where minor metadata changes are acceptable.
Phase 1: Extract the TGZ file
- Right-click the TGZ file and extract it with 7-Zip (or a similar tool).
- Extract the resulting TAR file.
- Open the extracted folder to access the EML, VCF, and ICS files.
Phase 2: Import EML into Classic Outlook
- Open Classic Outlook and create a new folder (for example, “Zimbra Import”).
- Drag EML files into that Outlook folder in small batches (100-200 at a time).
- Repeat until all EML files are imported.
Manual import warning
Dragging thousands of EML files into Outlook is slow and can change dates and metadata. Use the converter method for large mailboxes or strict metadata requirements.
Manual import failure checklist
- Outlook freezes: reduce batch size and wait for import to finish.
- Corrupt EML files: skip the bad file and continue.
- Missing attachments: re-extract the TGZ and try again.
Phase 3: Export the final PST from Outlook
- Go to File > Open & Export > Import/Export.
- Select Export to a file and choose Outlook Data File (.pst).
- Select your import folder and check Include subfolders.
- Choose a save path and finish the export.
Contacts and calendar: Import .vcf (contacts) and .ics (calendar) files separately using Outlook’s import wizard.
Method 2: Convert Zimbra TGZ to PST using SysCurve Zimbra TGZ to PST Converter
Use a Zimbra TGZ to PST converter when you need speed and better metadata preservation for large mailboxes.
Instant Solution - SysCurve Zimbra TGZ to PST Converter
Convert Zimbra TGZ to PST, EML, MBOX, MSG, and other file formats.
- Keeps folder hierarchy and attachments intact.
- Better chance of preserving dates and metadata than manual drag and drop.
Important: Microsoft Outlook must be installed on the same PC to create a PST. Outlook does not need to be open during conversion.
- Install and open the SysCurve Zimbra to PST Converter.
- Add your TGZ file(s).
- Preview the mailbox and choose PST as the output.
- Pick a save location and run the export.
Post-migration: Import and verify the PST
- Open Outlook and go to File > Open & Export > Open Outlook Data File.
- Select the PST and load it in the left folder pane.
- Spot-check emails, attachments, and folder structure.
- Test search to confirm indexing.
Related guides
- How to convert EML to PST
- How to convert MBOX to PST
- Thunderbird to Outlook conversion
- Import Outlook to Thunderbird
Frequently Asked Questions (FAQ)
Can I convert a Zimbra mailbox (TGZ) to PST without Outlook?
SysCurve requires Classic Outlook installed to create PST output. If you cannot install Outlook, export to EML/MBOX or move the TGZ to a Windows PC with Outlook and create the PST there.
Does Outlook for Mac export PST?
No. Outlook for Mac exports to OLM. For PST output, move the TGZ file to a Windows PC and use Classic Outlook or a converter.
Will my sent and received dates remain unchanged?
Manual drag and drop can change dates or metadata. A converter is the safer option when metadata must be preserved.
How should I handle a TGZ file larger than 10GB?
Use a converter and split the output PST if needed for performance. Manual import is slow and error-prone at this size.
Are contacts and calendar included?
Manual conversion requires importing VCF and ICS files separately. A good converter can include these items in the PST.
Does New Outlook support PST export?
New Outlook can export PST in some setups, but it has limitations. Classic Outlook is recommended for PST workflows involving contacts and calendar.
Do I need Zimbra Desktop to export TGZ?
No. You can export TGZ from Zimbra Webmail under Preferences and Import/Export.
Does SysCurve require Outlook to create a PST file?
Yes. SysCurve requires Microsoft Outlook (Classic) installed on the same Windows PC to create PST output.
Does SysCurve offer a free trial?
Yes. You can test the converter on your TGZ file to validate output quality before purchasing.
The Final Word: Your Migration, Your Choice
Manual conversion works for small mailboxes, but it is slow and can change metadata. For large or business migrations, a converter is the safer and faster path.
Choose the method that fits your mailbox size, data integrity needs, and timeline.
