How to Convert OST to CSV Format? Verified Solution

Written By Lovely Baghel
Published on: August 12th, 2025

Are you tired of managing several OST files and need to streamline everything altogether? If that’s the case, then all your issues are resolved. To combine data and to use it effectively for contact management, analysis, or similar purposes, convert OST to CSV. In this guide post, get to know the manual solutions and a SysInfo OST to PST Converter Tool for the export. As well as, also get some useful tips and other necessary information for the same.

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What Makes Convert OST Files to CSV Ideal?

OST (Outlook Storage Table) files are copies of the Cache Exchange Server data. These can only be used within the active Outlook connected with Exchange. This can be a problem when you need to share data across platforms or use it for compliance, archive, analysis, or other purposes. All of which can be swiftly managed with the CSV (Comma Separated Values) format.

Besides this, other factors through which users are motivated to convert an Outlook OST file to a CSV file are:

Sort and analyze data in spreadsheets with the use of charts, graphs, and other functions.
Open data without Outlook anywhere and everywhere in a more acceptable format, useful in the long term.
Ensures the data is human-readable and beneficial for CRM, marketing teams, and other email, network drives, or cloud platforms.
Create secure backup copies of the data while maintaining consistency and intact formatting.

Didn’t you need the same? Yes, so now let’s understand the methods that can change your file formats.

Various Techniques to Convert OST to CSV Format

In this upcoming section, you will find some simple and easy-to-follow procedures to change the formats. Whether you are an individual, an enterprise, or an IT admin, anyone can do it manually or use professional software. However, the free method can be tiring, and you can face several obstacles with it. So, let’s get started to identify which one is the most appropriate for your conversions.

Top Free Way to Export OST Data to CSV

Before you begin with this manual method, there are two things you must ensure:

Active MS Outlook account with Exchange connection
A copy of the OST file present within your MS Outlook profile

If you have the same, then proceed with the following steps:

Open the Outlook and directly move to the File.
Expand it and go for the Open & Export field.
Then, simply start the Import/Export wizard from the section.
Further, use the Export to a file option and choose the output CSV format.
Click Next, and after that, select the Outlook OST mailbox folder to convert.
Choose the Include subfolder option and apply the filters (optional).
Afterward, click Next and browse a destination for your Comma Separated Value file.
At last, choose the option for duplicates and click Finish to complete the export.

Exclusive Automatic Method to Convert OST to CSV

While the manual method converts a small batch of OST files, it isn’t convenient for large enterprise-grade migrations. So, for that, use the OST Converter Tool to ensure you can bulk convert data in minimal time, efficiently and accurately. Additionally, it keeps your data integrity intact and structure preserved. Moreover, any user can utilize the tool on Mac or Windows OS without Outlook installation.

In all, it means users can convert all the data in no time without loss or alteration. To verify this, take a look at this user case:

“I am working with a tech firm and have about 20 GB of Outlook global address OST data. I need it all in the Excel CSV format for analysis, but manually it seemed too complex and time-consuming. So, I used the OST to CSV Converter Tool, and all my data changed within a day without loss. I can now continue with my tasks without difficulties.”

To know how to convert OST file into CSV, take a look here:

Launch the advanced utility on your computer.
Then, add all your Outlook data files (.ost) into it to load.
Wait and click Next to preview the mail data. Also, select the folders.
Further, click Next once again and proceed to choose CSV from the drop-down.
Afterward, apply all filters, and Path to Save must be set to save the data.
Finally, with the Convert button, you can successfully complete the export.

Convert OST to CSV: Why the Tool and Not Outlook?

Take a look at this difference table to understand why to opt for a tool-based method over the native Outlook solution.

Manual Method	Professional Tool
Time-consuming, requires a lot of manual effort, and repetitive steps	Saves time with automation, costs with the trial version, and even efforts
Unsuitable for large and bulk OST files with attachments	No restriction on file number or size of OST and converts in batches
Limited customization options with no security of data	Many filters with complete security and a guarantee for the folders

Other than this, if you still go for the manual way, then:

Take a backup beforehand in CSV or other formats using this tool.
Keep your Outlook updated and active with a proper connection.
Ensure stable internet and healthy OST files are available in your account.

Conclusion

If you are looking to convert OST to CSV (contacts) or are only exporting emails, use the dedicated tool for the same. Because a manual process may be fine for a few emails or so, but the tool will help you in the long run. It is secure, updated, works automatically, has a free version, and needs no MS Outlook. So, in the end, it is upto you to choose a reliable and scalable solution, but a tool must be the optimum choice.

Frequently Asked Questions

Q1. Can I convert OST files to CSV without Outlook?

Ans. Of course, you can. For users who don’t have Outlook or do not want to install and get involved with the manual hassle. The versatile OST File to CSV Converter is their go-to option. It works without Outlook and requires only your healthy OST file, of any size or count.

Q2. Which tool is best to convert OST to CSV?

Ans. The SysInfo OST Outlook Converter is the best tool to convert OST files to CSV, whether you are a new user or an expert.

Q3. Why should I convert an OST file to CSV format?

Ans. The reasons included in the conversion are:
1. Scalability and easy data accessibility globally
2. Ability to analyze, sort, and edit data with ease
3. Maintain data to use in the future
4. Open OST mailbox folders without Outlook

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About The Author:

Lovely Baghel

As a content writer, I specialize in Email Migration, Data Recovery, Email Backup, and File Management. I have been writing professionally for two years now. There is so much information available in this field that I am intrigued by the newer technologies and techniques.