How to Import single and multiple OST File to Microsoft 365?

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If you’ve ever used Outlook, you have an idea what an OST file is. It’s an offline version of your mailbox that allows you to use your emails, contacts, and calendars without any internet access. But what do you do when you move to Microsoft 365 and want that OST data in your new cloud mailbox? Copying files manually will not work, as OST files are linked to an Exchange profile and you cannot open them in a different environment. That is when a professional OST to Office 365 conversion tool becomes essencial. In this article, we will understand why direct import of OST to Office 365 is not possible, and how can you effectively and efficiently import single or multiple OST files into Microsoft 365 without losing your crucial data. Why Can't You Import OST Files to Office 365 Directly? An OST file is not a regular data file. It is what Outlook creates and syncs with an Exchange or Microsoft 365 account, so that means it is tied to that one particular mail profile. If the original account is deleted, corrupted, or never accessible, that OST file is become orphaned, and unusable by Outlook. So when you are moving to Microsoft 365, you cannot just drop that OST file into the new mailbox. It needs to be converted into something that Microsoft 365 will be able to read and accept, and then it needs to be uploaded in the right manner. What You Need Before Starting the Migration A valid user account with administrative privilege in Microsoft 365 or Microsoft Exchange. Permission or Access to the OST file that need to be migrated. A trusted automated tool for converting OST files to Office 365. A good Internet connection for the process. Uploading data through a bad connection will only waste your time. How to Import a Single OST File to Microsoft 365 For users dealing with just one mailbox, the process is fairly straightforward when using the right software. Step 1: Download the Migration Tool Download and install reliable MailsDaddy OST to Office 365 Migration Tool. This utility is designed to open orphaned OST files, without the need for a live Outlook profile. Step 2: Start the tool and navigate to select the OST file that you want to migrate. The program will scan and load all the mailbox items such as emails, contacts, calendars, and attachments. Step 3: Most trusted solutions MailsDaddy being one of them allows you to preview folders and emails before migration. It is for data validation before go ahead. Continue with migrate button. Now select your options accordingly (i.e Choose the mailbox type: Primary, In-place Archive, Shared mailbox and Group mailbox based on your need, Date filter, Enable/Disable incremental migration etc. also select the path for log file) Step 4: Enter your Microsoft 365 credentials to log in and connect to your cloud mailbox. Step 5: Press on the Start Migration button. The tool logs in to your Microsoft 365 mailbox and imports the OST data to it, without modifying any formatting or folder structure. How to Import Multiple OST Files to Microsoft 365 For businesses handling employee mailbox migrations or IT admins managing bulk data transfer, migrating multiple OST files at once saves significant time and effort. The MailsDaddy OST to Office 365 Migration Tool comes with a bulk migration mode designed exactly for this situation. Open the tool and Click on Bulk-Migration option Step 1: Instead of adding OST files one by one, you can import a CSV file containing the list of OST files along with their destination mailbox mapping. This is especially useful for organizations migrating dozens or hundreds of employee mailboxes. Step 2: Assign each OST file to its correct Microsoft 365 mailbox to ensure data lands in the right place. Step 3: Start the process, and the tool will handle multiple OST files simultaneously, converting and uploading them without manual repetition. Step 4: After completion, check the migration summary report to confirm all mailboxes were transferred successfully. This tool also includes the normal Filtered Migration feature, so you can search for emails by "sender", "subject", "date", etc and only migrate those specific items that you want; Useful when you don't want to transfer a whole mailbox. Additionally, A Migration History tab will retain every migration job. Displaying total items, migrated items successfully, and the skipped or failed ones, with a one-click Retry alternative for anything not performed. Why Choose an Automated Migration Tool Over Manual Methods? Maintain the original formatting of emails, contacts, calendars, and attachments without losing any data. Even if the original Exchange account has been removed, it can still work with orphaned OST files. For IT teams, bulk migration is a major benefit because it saves a lot of time. The interface is straightforward and easy to use, requiring no technical knowledge. Maintains folder hierarchy by ensuring that data always lands in the appropriate mailbox. Manual methods are laborious, dangerous, and frequently result in corrupted or partial transfers. On the other hand, an automated approach is simple to use and has a good successful migration ratio with no data loss. Conclusion Converting OST to Microsoft 365 doesn't have to be complicated. Whether you’re an individual user upgrading a single mailbox or an IT admin migrating a whole company- wide migration, a reliable tool makes all the difference. MailsDaddy OST to Office 365 Migration Tool provides an easy, safe and efficient way to transfer single and multiple OST file to Office 365 without any kind of data loss. If your Microsoft 365 migration is coming up soon, this tool can save you both time and hassle.