If you are planning to import PST files into an Office 365 shared mailbox but are unsure about the correct and secure approach, this guide will help you get started. Outlook PST files store emails, contacts, calendars, and attachments locally, which can lead to data loss, corruption, and storage limitations. Importing PST data into an Office 365 shared mailbox makes this information secure, centralized, and accessible to authorized users.
This guide explains the prerequisites and available methods to import PST files, including Microsoft’s native import options and an automated approach using BreviSoft PST Converter Tool, which simplifies PST migration to shared mailboxes without complex manual steps.
What Is an Office 365 Shared Mailbox?
An Office 365 shared mailbox is a mailbox that multiple users can access to read and send emails and manage a common calendar. Unlike user mailboxes, shared mailboxes do not have separate login credentials and are accessed through permissions assigned to individual user accounts.
Purpose of a Shared Mailbox in Office 365
Shared mailboxes are commonly used for collaborative email addresses such as support@, info@, or sales@. Multiple users can monitor and respond to messages without signing in separately. Shared mailboxes also support shared calendars and contacts, making them useful for team coordination.
Differences Between User Mailbox and Shared Mailbox
A user mailbox is associated with a licensed Microsoft 365 user account and is intended for individual use. In contrast, a shared mailbox does not require a license unless its size exceeds 50 GB and does not allow direct sign-in. Users access shared mailboxes through delegated permissions.
Why Import PST to an Office 365 Shared Mailbox?
PST files are Outlook’s default data storage format and contain emails, contacts, and calendar entries stored locally on a system. Storing PST files locally increases the risk of file corruption, malware attacks, and data loss. Importing PST files into Office 365 moves this data into Exchange Online, where it benefits from Microsoft’s cloud security and availability.
Common Scenarios for Importing PST Files
Organizations commonly import PST files when migrating from on-premises Outlook, consolidating legacy mailbox data, or making archived emails accessible to multiple users through a shared mailbox. PST imports are also used for compliance, eDiscovery, and record-keeping purposes.
Benefits of Importing PST into a Shared Mailbox
Importing PST files into a shared mailbox centralizes data in Exchange Online, ensures high availability, preserves email metadata, and allows multiple authorized users to access historical emails securely from any device.
Prerequisites to Import PST into Office 365 Shared Mailbox
Before starting the import process, certain permissions, roles, and file preparations are required to ensure a smooth migration.
Required Permissions and Admin Roles
To import PST files using Microsoft’s native Import service, the administrator must be assigned the Mailbox Import Export role in Exchange Online. In most cases, the Mail Recipients role or Global Administrator privileges are also required. Role assignments may take time to propagate.
Preparing PST Files Before Import
Microsoft recommends keeping PST files under 20 GB when using the network upload method for better performance. PST files should also be verified for corruption by opening them in Outlook before uploading.
Manual Method to Import PST to Office 365 Shared Mailbox
Microsoft provides native PST import functionality through the Microsoft 365 Import service, available in the Microsoft Purview portal. This method supports importing PST files into both user and shared mailboxes.
Step-by-Step Process Using Microsoft 365 Import Service
Using the network upload method, administrators upload PST files to Microsoft Azure storage and then map them to the destination shared mailbox.
- Download the AzCopy tool provided by Microsoft.
- Create a new PST import job in the Microsoft Purview portal to generate a Secure Access Signature (SAS) URL.
- Use AzCopy via the command line to upload PST files to Azure storage using the SAS URL.
- Create a CSV mapping file that maps each PST file to the target shared mailbox.
- Upload the CSV file and start the import job in the Purview portal.
Microsoft processes the data and imports it into the specified shared mailbox.
Limitations of the Manual Method
The manual import process is technically complex and requires command-line knowledge. PST files with items larger than 150 MB are skipped, folder hierarchies deeper than 300 levels are unsupported, and incorrect CSV mapping can lead to failed or misplaced imports. The drive shipping method also incurs a cost of $2 USD per GB and is limited to supported regions.
Automated Method to Import PST to Office 365 Shared Mailbox
While Microsoft provides native PST import options, they are often complex, time-consuming, and require technical expertise with command-line tools and CSV mapping. To simplify the process and reduce the risk of errors, many organizations prefer a dedicated software solution.
BreviSoft PST Converter Tool is designed to streamline the process of importing PST files into Office 365 shared mailboxes without manual scripting or complex configuration. The tool provides a guided interface that helps administrators migrate Outlook PST data directly into Microsoft 365 with better control and visibility.
How BreviSoft PST Converter Tool Simplifies PST Import
BreviSoft PST Converter Tool automates key steps involved in PST migration that otherwise require multiple manual actions. Instead of uploading PST files through Azure storage and creating mapping files, the tool allows users to select PST files locally and map them to the appropriate Office 365 shared mailbox through a controlled workflow.
The software supports importing Outlook emails, attachments, contacts, calendars, and other mailbox items while maintaining the original folder structure. This makes it suitable for organizations that want to centralize archived or legacy PST data into shared mailboxes for team access.
Steps to Import PST to Office 365 Shared Mailbox Using Brevi Software
The software follows a simple guided process:
- Launch BreviSoft PST Converter Tool on the system
- Select Outlook PST as the source and Office 365 as the destination
- Choose the mailbox items (emails, contacts, calendars, etc.) to migrate
- Apply optional date filters for selective import
- Add PST files or PST folder path
- Authenticate using Office 365 admin credentials
- Map PST data to the target shared mailbox
- Start the import process
Once the migration is complete, the tool generates a summary report to help verify the imported data.
Why Choose a Software-Based Approach Over Manual Methods?
Compared to Microsoft’s manual PST import methods, a software-based approach offers:
- Reduced technical complexity
- Faster setup and execution
- Lower risk of incorrect mappings or skipped data
- Better visibility into migration status and results
This makes BreviSoft PST Converter Tool suitable for administrators handling frequent migrations, large PST collections, or shared mailbox consolidation projects.
Conclusion
Importing PST files into an Office 365 shared mailbox is a practical way to centralize Outlook data and improve accessibility. While Microsoft’s native methods are effective, they can be challenging to manage. A dedicated solution like BreviSoft PST Converter Tool helps simplify the migration process by offering a structured, automated, and user-friendly approach.
If you are looking for a reliable way to import PST data into shared mailboxes without complex manual steps, a software-based solution can save time and reduce administrative overhead.
FAQs – Import PST to Office 365 Shared Mailbox
Ans:- Yes. Microsoft’s official Import service supports importing multiple PST files into a single shared mailbox using a CSV mapping file during the import process.
For administrators handling bulk PST data, tools like BreviSoft PST Converter Tool can simplify this process by reducing manual mapping steps while still targeting shared mailboxes.
Ans:- No. Microsoft requires administrator permissions, such as the Mailbox Import Export role or Global Administrator access, to import PST files into Office 365 mailboxes.
Once these permissions are in place, software-based solutions like BreviSoft PST Converter Tool help streamline the migration workflow.
Ans:- Yes. Microsoft offers a native PST import capability through the Microsoft 365 Import service in the Purview portal using network upload or drive shipping methods. However, Microsoft does not provide a simple, GUI-based one-click import wizard.
To address this gap, tools such as BreviSoft PST Converter Tool offer a more guided and user-friendly approach.
