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How to Convert Outlook Emails into TGZ Format Step-by-Step Guide
Posted: Jan 15, 2026
A lot of users have been looking for a reliable way to convert a lot of Outlook emails into TGZ format while keeping all of the mailbox information. Many solutions say they can convert OST to TGZ, but not all of them can handle large-scale conversion, work with Windows, or keep the data safe.
This guide shows you how to use the professional OST to TGZ Converter to turn OST files into Zimbra TGZ files in a complete and useful way. Read on to find the safest and most effective way.
Why Should Users Convert OST to Zimbra Desktop?There are many benefits to converting OST files to Zimbra TGZ format:
It can access all of the mailbox data with Zimbra Desktop, even if users don't have an internet connection.
When users manage Outlook and Zimbra data in the same place, it becomes easier to manage email.
There are no technical problems when syncing email folders and contacts.
Zimbra uses strong encryption to keep its data safe at all times.
The process of converting makes a stable copy of Outlook data in Zimbra format.
Are there ways to manually convert OST to Zimbra?Yes, there are ways to convert OST to Zimbra by hand. But these methods have a lot of problems and technical limits. The OST file must stay linked to its Outlook profile, and the whole process requires a lot of time and advanced configuration. The automated method is highly recommended for accurate and large-scale conversion.
Setting Up Manually
Step 1: Set up Zimbra IMAP in Outlook- In Outlook, click on File and then Add Account.
- Pick IMAP and type in the information for the Zimbra server.
- Turn on SSL/TLS and finish setting things up.
- In Outlook, open the OST mailbox.
- Put emails in the Zimbra IMAP folders by dragging them.
- Let the sync finish.
- Sign in to your Zimbra account
- Check that emails look right
- (Optional) Get TGZ from Zimbra settings
- Outlook must be connected to the OST all the time.
- It takes too long to process large mailboxes.
- There is a high chance that data and attachments will be lost.
- Setting up IMAP is hard and can lead to mistakes.
- No help for batch processing or automation
On the internet, there are multiple converters, but FixVare OST to TGZ Converter is a professional and powerful tool that ensures that conversions are always correct and stable. The software is made to convert a lot of OST files into TGZ format while keeping the mailbox completely intact. It works well on all Windows systems and doesn't need any technical knowledge.
How to Change OST to TGZ in Steps- Get the mentioned OST to TGZ Converter and start it up.
- Choose Files or Folders from the menu.
- Select the OST data you want to change
- Choose TGZ as the format for the output
- Pick the place you want to go
- To start, click Convert.
The Outlook data is quickly changed into TGZ files that Zimbra can read.
Advanced Features of This OST to TGZ Converter- Can change as many OST files as you want at once
- Keeps the original folder structure and metadata
- Keeps attachments, headers, and other email properties
- Works with all versions of Outlook and Windows OS
- Offers complete security without losing any data
- Let users choose the output path for their files
- Makes log reports for items that weren't converted
- Includes a free demo version for testing
This OST to TGZ Converter is a safe, reliable, and fast way to convert Outlook emails into TGZ format. It has advanced features, is very accurate, and is easy to use. It gets rid of the problems that come with manual methods and makes sure that even large mailboxes can be converted smoothly. The free demo version lets users test the tool before buying it, which makes it the best choice for professional OST to TGZ conversion.
About the Author
Archer Gyles writes technical blogs and product reviews for FixVare Software, focusing on Outlook recovery, email migration, and data management solutions.
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