
Email communication often contains critical information such as business discussions, legal records, project updates, and important attachments. Users may need to save these emails in a way that makes them easy to find, share, and keep without having to use a certain email client. This is when it is helpful to export Outlook data into a format that works on the web. OST files are used by Microsoft Outlook to store mailbox information locally. They are meant for syncing, not for long-term storage. OST files work well in Outlook, but they aren't the best choice for user who want to access their emails on their own or open them in a browser. This problem can be fixed by exporting OST files to MHTML, which saves emails, attachments, and links in one easy-to-read file. Understanding OST and MHTML File Formats When users set up Outlook with Exchange Server, Microsoft 365, or IMAP accounts, it makes an OST file. It syncs mailbox data on the user's computer so they can work without an internet connection. OST files are helpful, but they are closely tied to the Outlook profile and server account, which makes it hard to open or access them on their own. MHTML (MIME HTML), on the other hand, is a web-based file format that saves emails as a single HTML file with images, attachments, and links inside. It's easy to open MHTML files in web browsers like Chrome, Edge, and Internet Explorer. This makes them great for storing, sharing emails without Outlook, and keeping records for legal purposes. Why Exporting OST to MHTML Is Important In some real-life situations, it is necessary to export OST files to MHTML: When users want to read Outlook emails without having to install Outlook For legal or compliance reasons, when the content of an email must be kept with its formatting and links When moving or saving mailbox data in a format that works in a browser To send emails to users who don't use Outlook while keeping links and attachments intact When users can't get to an Outlook profile but need to save the OST data Users can't open OST files directly without Outlook and the original account. Exporting them to MHTML gives them more options and makes them easier to access in the long term. How to Export OST Files as MHTML There are mostly two ways to export OST files to MHTML format: Manual method using Microsoft Outlook Automated method with a professional conversion tool Manual Method to Export OST to MHTML Using Outlook Users can save emails as MHTML files manually if they have Outlook and the OST file is linked to an active profile. How to Manually Export OST Emails to MHTML Start Microsoft Outlook and set up the account that the OST file is linked to. Go to the folder with the emails in the mailbox. Open the email you want to send out Click on File> Save As Pick MHTML (*.mht) as the type of file Select a save location and click Save. Do these steps again for each email you want to send. Limitations of the Manual Method The manual method might work for a few emails, but it has a lot of problems: No option to convert in bulk Takes a long time for large mailboxes There is a chance that attachments or embedded elements will be lost. Needs Outlook to be installed and an active account to work Not good for OST files that are missing or cannot be accessed Because of these limits, people with large OST files or important data often look for a better way to do things. A Dependable Automated Way to Convert OST Files to MHTML Many users choose to use a dedicated conversion tool like FixVare
OST to MHTML Converter instead of manual methods because it can accurately export OST files while keeping the structure of the emails, attachments, and links. This solution can export multiple files at once and doesn't depend on Outlook settings too much, so it's good for both technical and non-technical users. Steps to Export OST Files to MHTML Using an Automated Tool Get the converter and put it on your system. Open the software and add the OST file. Look at emails and attachments in your mailbox before you open them. Choose MHTML as the format for the output file. Pick a folder to save it in Begin the process of conversion The process makes sure that the formatting of emails, attachments, and links that are embedded in them stays the same. Conclusion Exporting OST files to MHTML is a good way for users who want to easily access, store, or share Outlook emails safely. Outlook lets users save emails in MHTML format manually, but it's not a good way to do a lot of them or complicated ones. Automated tools make it faster, safer, and more reliable to export OST data while keeping attachments and links. The size of the mailbox, how easy it is to get to the OST file, and how important data integrity are all factors that affect which method to use.
About the Author
Archer Gyles writes technical blogs and product reviews for FixVare Software, focusing on Outlook recovery, email migration, and data management solutions.