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How to Open OST File in Outlook 365?

Summary: If you want to open OST file in Outlook 365, then this blog will guide you. Read the complete article and import OST to Office 365 mailbox along with complete email data and attachments.

Users can have access to advanced Exchange Server functionality without actually owning an on-premises Exchange Server in their company thanks to Exchange Online. Exchange Online is a component of the Business and Enterprise Editions of the Microsoft 365 subscription plans. Although it is available as a solo product, Microsoft 365 offers it integrated with other MS Office products. One advantage of having a Microsoft 365 subscription is the ability to purchase licences based on the estimated number of users.

We are aware that when Microsoft Outlook is used in offline mode with Exchange Server, OST files are used to store copies of users’ email messages, contacts, and other data. Users may want to import their OST files while switching to Office 365 so they may continue using the same email messages, contacts, and other data. This article walks readers through the process to open OST file in Outlook 365 step-by-step.

Why Need to Open OST in Office 365

There are many benefits to storing your Exchange mailbox data on a cloud platform like Office 365. Office 365 emails are available to everyone as long as they have internet access. Office 365 mailboxes can be accessed from a variety of devices, including iPads, iPhones, Android phones, and more. Consequently, a lot of Exchange users want to maintain a replica of their Exchange mailboxes on Office 365. One can transfer their offline Outlook Data File (OST) to Office 365 accounts to make this process simple. There are numerous ways to accomplish this. For the purpose of maintaining their emailing tasks, Office 365 allows both Exchange users and webmail users to import their OST emails.

Instant Solution: Take the assistance of the OST Converter tool offer by SysConverter to export the OST/PST files to Office 365 with all the mailboxes and permissions.

Reasons Why Users Switch to Office 365 from OST-

  • The organizational change brought on by Office 365’s benefits
  • Exchange failures on a regular basis and the necessity for a solid platform
  • More emails than OST can be stored in Office 365 mailboxes.
  • Need to prevent significant Exchange maintenance outages
  • Office 365 provides improved security measures and the ability to delete sensitive data.
  • Compared to Outlook, this platform is more practical.
  • rapid access to data in a secure environment following an unintentional loss
  • Accessibility from anywhere and the need to conveniently access data from multiple devices

How can I import my old OST emails into Office 365?

There isn’t a direct way to transfer OST emails to Office 365. To transfer OST files to Office 365, you must first convert them to PST format. To preserve OST emails directly in Office 365 accounts, there are numerous third-party programmes available. There are two popular ways to do this:

1. OST file conversion to PST format followed by Office 365 upload

2. Directly import OST files into Office 365 with the aid of third-party solutions.

Method 1: Export OST Emails to PST and Open in Outlook 365

This is a two-step process that uses an indirect method to export OST files to Office 365, but first you need to convert OST to PST format..

This indirect method has three phases and a number of steps.

1. First, convert the OST file to a PST file.
2. You can either ship the converted OST files to Microsoft’s data centre or upload them to Azure Storage.
3. Open an Office 365 PST file for import.

The Outlook profile must be active and reachable from Outlook in order for this method to function. This approach won’t work if the email profile is gone or if you have OST files from inactive or old email accounts. Skip to Method 2 in this situation.

Method 2: Direct Way to Open OST Emails in Outlook 365

When importing OST files into Office 365 mailboxes, you can use a tool that converts OST to PST, such as SysConverter for OST Technician. With the original folder structure and hierarchy intact and without any restrictions, this enables you to export all of your offline Outlook data (.ost) files to Office 365.

Office 365 allows you to quickly and easily open OST file in Outlook and other latform. This software can assist IT or Exchange administrators in migrating or importing user mailboxes from deleted accounts.


Office 365 offers cloud-based email services (Exchange Online), in addition to a wide range of other apps and services, making it an affordable option for many SMEs. Security, updates, and hardware management are taken care of for you. You also have free access to desktop and cloud versions of Office programmes like Word, Excel, and Outlook.

This guide explains how to import OST into Office 365 manually and using software. The manual methods require a lot of time and effort and may not yield the desired outcomes. The OST to PST converter tool, on the other hand, is more practical and simple to use. Using the software, you can directly import OST files into Office 365. The software also assists in retrieving deleted emails from mailboxes.

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