How to open an OST File in Office 365?

#1

An OST file (Offline Storage Table) is a local copy of your mailbox stored on your computer. It allows you to access your email, calendar, and contacts offline and make changes that will sync with the Exchange server the next time you connect. If you are using Regain OST to Office 365 Migration Tool, you can open an OST file by following these steps:

  1. Access Outlook and navigate the “File” tab in the top left corner.
  2. From the “Account Information” section, click on the “Account Settings” button.
  3. From the “Account Settings” window, select the “Data Files” tab.
  4. Click the “Add” button to open the “Open Outlook Data File” window.
  5. Please navigate to the location of the OST file on your computer and select it.
  6. Click “Open” to add the OST file to Outlook.

Note: If the OST file is password-protected, you must enter the password before it opens.

Once you import the OST file to Outlook, you can access the email, calendar, and contacts stored in it, just like any other email account.

Get more detail visit this post - Import offline OST to Office 365

#3

To open an OST File in Office 365 is directly not possible. You can convert those OST files into PST format and then import that PST files into Office 365 account as that can be simple to do. For converting the OST files into PST format you can take help of GainTools OST to PST Converter application and simply convert the files safely in a few clicks. The user can use this tool on any Windows OS. Refer this article for more details: https://www.gaintools.com/blog/import-ost-to-office-365-with-emails-and-attachments/

#4

If you need to open OST files to Office 365 account, using a reliable tool like Softaken OST to Office 365 Converter is the best solution. This software efficiently migrates emails, contacts, calendars, and other data from OST to Office 365 with complete integrity. It supports bulk conversion, allowing multiple OST files to be processed at once while preserving folder hierarchy and metadata. The user-friendly interface makes the conversion process simple, even for non-technical users.

#5

To open OST file in Office 365, try professional tool Shoviv OST to PST Converter. The tool export single or multiple OST files into Office 365 and On-Premises Exchange Server. The tool has multiple user-oriented features. Its mapping option helps to map OST files with Office 365 mailboxes without any hassle. The user must have Global Admin Right and Other Office 365 mailboxes’ full access right to fetch all mailboxes. With the help of this users can also save OST into various file formats such as PST, MSG, HTML, EML, vCal, and vCard.

#6

To manually open OST file in Office 365, you need to convert the OST file to a PST file first, as Office 365 doesn’t support OST file formats directly. This process involves using Outlook’s Import/Export feature to export the OST file to PST. Once the PST file is ready, it can be imported into Office 365 using the Office 365 Import Service via the Security & Compliance Center. However, the manual method is complex and prone to challenges such as potential data loss, file size limitations, and the need for technical expertise. Additionally, it can be time-consuming, especially for large mailboxes or multiple accounts.

On the other hand, with third-party tool like Advik OST Converter , you can easily import OST to Office 365 account. The software can directly upload OST file to Office 365 without any external help. With this utility, you can import multiple OST files at once. The tool offers a secure and retentive email migration, in which the OST file and its metadata is maintained throughout the importing process.