Tips to Convert OST to PST in Office 365 Webmail

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Here we will talk about how to convert OST to PST in Office 365 cloud database. I have discussed two alternate ways to convert OST database to Exchange Online (Office 365). If you are planning to switch data from OST to Office 365 then this blog will assuredly help you.

How to Import OST File in Office 365 Cloud?

There are no direct methods available to import OST file in Outlook web app. But if you still need to know the process of importing OST data file in Office 365, then you want to convert OST file in PST format after that you can manually import PST in Office 365 cloud mailbox using MS Network upload method. And you can also use a third party tool for uploading OST files straight into Office 365 webmail. There are a number of third parties solution, OST Converter is one of them. It will support you to convert OST file in Exchange Online account including all types of data like emails, contacts, calendars, tasks, attachments, notes, etc.

Here I am going to describe two different methods of exporting OST to PST in Office 365. So, read out both the methods and choose a suitable one for your conversion from OST mailbox to Office 365 cloud mailbox.

Method 1. Manually Import OST File to PST File, Upload to Office 365

It is the indirect approach to migrate OST file to Exchange Online. By using this method, first you need to convert OST file into PST file, then you can upload to Outlook 365.

Stage 1. Import OST File into PST File

  1. Open your MS Outlook account >> File >> Import and Export
  2. Choose Export to a file and press on Next
  3. Then go to Personal Folder File (.pst) >> Next
  4. Browse the location where you want to save the file and check " Replace duplicate with items imported " and press on Next
  5. Enter the password (if you wish, otherwise skip it) and press Ok

Important Note: If the exchange server is offline or you are not connected to the server on this time provided method will not work then easily use the OST to PST software for successfully converting OST file into PST file format.

Stage 2. Move PST File to Office 365 Webmail with Network Upload Method

  1. Admin needs to install Azure AzCopy tool, which will convert PST file into Outlook web app and copy the SAS URL, which is a network combination URL for the Azure storage location in Exchange online and SAS (Shared Access Signature) key. Due to SAS key admin get the access to transfer PST files into the Azure storage location.
  2. Now, admin can simply import the PST files in Azure storage location in the cloud. AzCopy.exe application will move PST files in Office 365 cloud platform.AzCopy.exe application will move PST files in Office 365 cloud platform.
  3. Admin can view the complete of the uploaded PST emails that are migrated in Office 365 webmail by configuring the Azure Storage Explorer.
  4. After importing the PST emails in Exchange online database, the admin has to make a CSV file that will define the mailboxes for which is the PST files are migrated in OWA account.
  5. In the last step, the admin will make an import job in Office 365 that use information from CSV file to move PST files to the user mailbox.

Cons of Manual Approach:

  • Time-taking and too-lengthy process to follow for converting OST files in Office 365
  • A requirement of complete technical knowledge to follow the process
  • Not suitable for bulk data conversion from OST to PST in Office 365

Method 2. Migrate OST File to Office 365 using OST Converter

OST in Office 365

As we can see that the above-mentioned method is very tricky and time-consuming. So if you are not aware of Azure Copy tool, then I will recommend you to use OST to Office 365 Migration Tool. It provides very simple GUI that is easy to use by any user or professional user for uploading in few clicks only. The best thing about the tool is it provides preview facility to view the selected OST files in a software preview pane. It is very easy and trusted solution that provides 100% assurance of success to the users. By using this OST to Office 365 Migration Tool, you can convert your data from OST folder including emails, calendars, contacts, notes, tasks, appointment, formatting, and attachments into Office 365 without any changes.


In this post, I have discussed two different ways to convert OST to PST in Office 365 mailbox. The first methodis removelength and time -taking since the second method is an instant solution for importing OST files into Office 365 cloud database. So you can opt torequiredmethod as per your need. If you have any doubt on the second method, then you can try OST to Office 365 download edition help to learn how to convert OST to PST in Office 365 webmail with converting first 20 items from OST mailbox to Exchange online account.

Nick Shelmer
You can solve all your conversion issues of OST to PST migration process by using the OST to PST Converter application which is the data great tool to use with full accuracy. To get this tool or to try this tool you can visit here:-