How to Import PST File to Office 365

How to Import PST File to Office 365 in a Smooth Way

Microsoft allows the users to perform PST migration to Office 365 (Exchange Online) and also, encouraging small as well as large sized organizations to perform cloud migration operations. However, it is quite challenging for the users to move from on-premises environment to the cloud as they face many challenges during the process. Today many organizations are transferring their on-premises data to Office 365. According to the organizations maintaining data on cloud storage is more cost effective than storing data on-premises, which is the main reason behind on-premises to cloud transition. However, Organizations can not take this transition to the cloud lightly as it involves a huge planning and processes to make a transition from an established infrastructure to a cloud environment. Read More

When we talk about any organization; to migrate on premises Exchange to Office 365, admin can use various manual as well as automated methods. In this article, we will discuss the need and different approaches that would help the users to migrate Outlook PST to Exchange Online.

Uploading PST Files to Office 365/ Exchange Online: The Challenges

  • Migrating PST data to Office 365 is not an easy task as it involves huge planning to make the transition from established infrastructure to the cloud.
  • Before exporting Outlook data file emails to Exchange Online, one needs to start over with spam filtering.
  • When user syncs PST to Office 365, users outbound email addresses might change and it makes default email address that ends in
  • Once the on-premises data uploaded to Office 365, organization admin will not have any control over the management process, software upgrades and on other administrative task.
  • The user may face DNS issues and need to reset file server permission.

Need for Migrating PST Data to Office 365

  • It offers an efficient way to upload/ export organization's email to Microsoft cloud.
  • On-premises PST migration to Office 365 saves infrastructure and maintenance cost.
  • It offers additional mailbox storage space by enabling mailboxes archiving.
  • Migrating PST data to Office 365 enables users to stores entire email mailbox data of organization in a centralized way.
  • Moving PST file to O365 enables the users to keep their mailboxes on hold to preserve content.
  • It offers a better searching option to search any content within a mailbox, as it offers Microsoft eDiscovery tools to search for data in mailboxes.
  • Enables users to impose retention policies to control how long mailbox data is retained.
  • The user can check or audit all mailbox related event with the help Office 365 audit log.
  • It protects crucial data against any intentional or intentional data loss.
  • By uploading PST files to Office 365 mailboxes makes data highly available, users can easily access Outlook emails and other mailbox data from anywhere with the mere availability of the network. Also, cloud data is always available to all users of the organization from all devices.

How to Import PST File to Office 365 – The Methods

  • Install Azure AzCopy tool that will copy/ move PST file to Office 365. Now copy the SAS URL of the organization. Where, SAS URL is a combination of network URL for the Azure storage location in Office 365 and Shared Access Signature key.
  • With SAS key admin get the permission to upload PST files to Azure storage location.
  • Now admin can move/ copy data files in an Azure storage location with the help of AzCopy.exe tool that will migrate PST to Office 365.
  • Admin also can check a list of uploaded PST files with the help of Microsoft Azure Storage Explorer.
  • Once the PST files are moved/ transferred to cloud storage, the admin will create a CSV file that will define the mailboxes associated with corresponding PST files.
  • At last, an admin will create an import job in Office 365 that will use information from CSV file to import PST files to the corresponding user mailbox.

Automated Tool to Import PST to Office 365 Account

    To import Outlook PST data items like emails, contacts or calendar to Office 365 account then you can use Office 365ImportPST Tool that would help you to migrate Outlook data to Office 365 cloud.
    The manual method that includes Azure Azcopy or drive shipping or network upload would lead you to waste a lot of time and is very lenghy process. So, we would recommend you to use an automated tool that can easily help you to import Outlook emails to Office 365 account.

    System Specifications
  • Hard Disk Space: 50 MB of free hard disk space
  • RAM : 512 MB of RAM (2 GB is recommended)
  • Supports : Windows 10(64 & 32 bit) And All Below Version
  • Processor : 1 GHz Processor (2.4 Ghz is recommended)


The shortcomings of these manual procedures are as follows:


On-premises to the cloud migration is always cost effective for the users, in addition, it also offers many other advantages such as data availability, centralized data, and security, etc to the user. In this article, we have discussed how to import PST file to Office 365. With O365 import service, an organization can easily move their on-premises email data to the Office 365. However, it needs proper planning to perform migration from established infrastructure to the cloud.