Export Shared Mailbox to PST: Full Guide

Yes, you can export a shared mailbox to a PST file, but the method depends on whether you use Outlook desktop or Outlook on the web. This guide covers the exact steps for both, plus what to do when the standard export option is missing.

What a Shared Mailbox Is

A shared mailbox is a mailbox that multiple users can access to send and receive email. It is not tied to a single user’s login, so it appears in Outlook alongside your own mailbox. Common uses include team inboxes like info@company.com or support@company.com. Because it is shared, exporting it to a PST (Personal Storage Table) file lets you archive, back up, or migrate its contents.

Export from Outlook Desktop (Windows)

If you have the shared mailbox added to Outlook for Windows, the built-in export tool works well. Here are the steps:

Open Outlook and make sure the shared mailbox appears in the folder pane. If not, go to File > Account Settings > Account Settings, select your email account, click Change, then More Settings > Advanced, and add the shared mailbox.
Go to File > Open & Export > Import/Export.
Choose Export to a file and click Next.
Select Outlook Data File (.pst) and click Next.
Select the shared mailbox folder (e.g., Shared Mailbox – Inbox). Check Include subfolders if you want everything.
Click Next, choose a location and name for the PST file, and set your preferred options (duplicates, etc.).
Click Finish. Outlook will create the PST file.

This method works for all items: emails, contacts, calendar entries, and tasks. The PST file can be opened later in Outlook via File > Open & Export > Open Outlook Data File.

Export from Outlook on the Web

Outlook on the web (OWA) does not have a direct “Export to PST” button. Instead, you must use the eDiscovery or Content Search tools in the Microsoft 365 admin center. This requires administrator permissions.

Go to the Microsoft 365 Compliance Center (compliance.microsoft.com) and sign in as an admin.
Navigate to Content search (under Search & investigation).
Create a new search, give it a name, and under Locations select Choose mailboxes and add the shared mailbox.
Run the search, then click Export results. Choose to export to a PST file (you can also export to individual messages).
Download the exported PST from the Export tab.

This method is more complex but is the official way to export a shared mailbox without Outlook desktop. If you do not have admin rights, ask your IT department to perform the export.

Why the Export Option May Be Missing

Sometimes the Import/Export option is grayed out or missing in Outlook. This can happen if:

You are using Outlook for Mac (the built-in export is limited).
Your organization has disabled the export feature via Group Policy.
You are using a web-based Outlook (OWA) where export is not available.

In these cases, use the admin center method or a third-party tool. Many third-party tools can connect directly to Microsoft 365 and export shared mailboxes to PST without needing Outlook. Always choose a reputable tool and read reviews before using it.

Common Problems and Solutions

Exporting a shared mailbox can hit a few snags. Here are typical issues and fixes:

“Cannot export because the mailbox is not in your profile” – Re-add the shared mailbox as described in the desktop steps.
Export is slow or hangs – Large mailboxes (over 50 GB) can take hours. Try exporting subfolders one at a time.
PST file is too large – PST files have a size limit (20 GB for older Outlook, 50 GB for newer versions). If you hit the limit, split the export by date or folder.
Permissions error – You need at least “Full Access” permission to the shared mailbox. Contact your admin if you lack it.

Comparing Export Methods

The table below summarizes the two main methods.

Method	Pros	Cons
Outlook Desktop	Easy, no admin needed, works offline	Requires Outlook installed, may be slow for large mailboxes
Admin Center (eDiscovery)	Works without Outlook, handles large mailboxes, can filter	Requires admin rights, more complex, exports via web download

Costs and Alternatives

Exporting to PST is free using built-in tools. Third-party tools often have a free trial but require a paid license for full functionality. If you need to archive a shared mailbox permanently, consider these alternatives:

In-Place Archive – Microsoft 365 offers an archive mailbox that can be enabled for shared mailboxes (with appropriate licensing).
Mailbox backup services – Cloud-to-cloud backup solutions (like Veeam or Barracuda) can back up shared mailboxes without PST files.
Export to another mailbox – You can copy items to a personal folder or another mailbox using Outlook rules or drag-and-drop.

Frequently Asked Questions

Can I export a shared mailbox without admin rights?

Yes, if you have Full Access permission and Outlook desktop, you can use the Import/Export feature. If you only have web access, you need an admin to run eDiscovery.

How long does it take to export a shared mailbox?

It depends on the size. A few hundred MB might take minutes; a 50 GB mailbox could take several hours. Exporting subfolders individually can speed up the process.

Can I open a PST file on another computer?

Yes, PST files are portable. You can open them in Outlook on any computer by using File > Open & Export > Open Outlook Data File.

Does exporting to PST include attachments?

Yes, the PST file contains all items including attachments, as long as you select the folders that hold them.

What if the shared mailbox is in Exchange Online but I use Outlook for Mac?

Outlook for Mac does not have a direct PST export. Use the eDiscovery method or a third-party tool.

Is it legal to export a shared mailbox?

Generally yes, if you have permission. Check your organization’s data retention policies and any applicable regulations before exporting.

Method: the standard formula for this calculation, rounded as each result states. See how the calculators work or report an error.

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