Short answer: New Outlook for Windows can import a defined group of preferences from classic Outlook, but it is not a settings-for-settings replacement. PST support is still partial in new Outlook, and rules import/export is unsupported according to Microsoft’s feature comparison last updated September 23, 2026. Treat three jobs separately before you switch: migrate supported settings, confirm where each account’s data lives, and make an independent copy of any PST data you cannot afford to lose.
An OST belonging to a server-backed account is normally a downloadable offline copy, not your only archive. A PST is a separate Outlook data file used for exports, archives, and some POP accounts, so important PST content should be copied to another storage location.
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New Outlook and classic Outlook are not feature-identical
The two Windows clients can use the same mailbox, but they do not expose the same settings, storage workflows, or add-in and rules support. Microsoft’s feature comparison, updated September 23, 2026, marks PST support as partial in new Outlook and lists rules import and export as unsupported there. The matrix is updated over time, so check the live comparison for any feature your work depends on before changing clients.
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| Question | Classic Outlook | New Outlook for Windows |
|---|---|---|
| Can settings be moved? | Acts as the source for the documented first-run settings import. | Can import a defined subset when classic Outlook settings are stored in the cloud. |
| Are rules portable? | Supports the classic Outlook rules workflow. | Rules import and export are listed as unsupported in Microsoft’s September 23, 2026 comparison. |
| What is a PST? | Can create, open, export, and use PST files for archives, exports, and POP data. | PST support is partial; current versions can export and can open or import a PST under stated requirements. |
| What is an OST? | Offline synchronized copy for supported server-backed accounts. | Also represents synchronized server data when the account and client use an OST workflow. |
| What does a PST export preserve? | Mail and other selected Outlook items copied into a data file. | Imported items can be copied into a mailbox, or a PST can remain open as a separate data source. |
| Does a PST recreate the whole profile? | No. Export omits several Outlook configuration details. | No. A PST is data, not a complete client profile backup. |
That distinction matters when a switch appears successful. Seeing messages in the new client does not prove that rules, views, permissions, archive behavior, blocked senders, or every local folder has moved.
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Can I transfer my Outlook settings to the new Outlook?
Yes, but only the settings Microsoft documents for the import are transferred, and the import is conditional. During the first setup of new Outlook for Windows, choose the option to import settings from classic Outlook. In classic Outlook, the option General > Store my Outlook settings in the cloud must be selected. Microsoft says Outlook must be restarted after that option is changed.
Settings Microsoft lists as importable
The documented list covers preferences across mail and calendar, including:
- Reading-pane position.
- Density and related display preferences.
- Signatures.
- Automatic replies.
- Quick Steps.
- Default font.
- Meeting hours.
- Time zones.
- Reminder settings.
- Calendar view.
The list is a subset, not a promise that every profile setting, account property, local customization, or folder configuration will transfer. If a setting is important, record its value in classic Outlook before you switch and test it in new Outlook afterward.
What happens to classic Outlook add-ins?
During preference import, new Outlook can install web-add-in counterparts for existing classic Outlook COM add-ins when counterparts are available and administrator policies allow them. This does not mean the original COM add-in will run in new Outlook. A web counterpart may have different commands, permissions, and capabilities, so verify the specific task you use rather than assuming compatibility from the add-in’s name.
What does not come across automatically?
Do not treat the import as a profile clone. Microsoft’s documentation does not establish automatic transfer for every rule, local configuration, folder view, permission, AutoArchive choice, blocked-sender list, or account profile detail. In particular, the feature comparison lists rules import and export as unsupported in new Outlook. Plan to recreate or document settings that are outside the published import list.
How to compare the features you actually use
A feature matrix is more useful than a general “new versus classic” verdict because your account type and workflow determine the impact. Before switching, make a short inventory of the actions you perform every week.
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Check mail-processing features
- Rules that move, flag, forward, or delete messages.
- Quick Steps and custom commands.
- Signatures and automatic replies.
- Blocked senders and other filtering choices.
- Shared folders, delegated access, or permission-sensitive mailboxes.
Check calendar and scheduling features
- Multiple time zones and meeting-hour restrictions.
- Reminder defaults and calendar views.
- Shared calendars and delegated scheduling.
- Any add-in that creates or modifies meetings.
Check data-file features
- Whether you open an existing PST directly.
- Whether you export mail or calendar data to PST.
- Whether a POP account stores its messages locally.
- Whether an archive PST is part of your normal search process.
Use Microsoft’s current feature comparison immediately before the change. The September 23, 2026 date identifies the version of the comparison reviewed here; support can change after that date.
Where does Outlook store my email?
The answer depends on the account and on whether the data is server-backed or a separate local file. The two file types most often confused are PST and OST.
PST: a separate Outlook data file
Microsoft describes a PST as a container for Outlook messages and other items, including contacts, appointments, tasks, notes, and journal entries. PST files are used for exports, older-item storage and archives, and POP3 account data. Microsoft’s documentation says they are ordinarily stored under DocumentsOutlook Files on Windows, although a user or administrator can place a file elsewhere.
A PST is independent of the mailbox copy held on a server. Deleting or losing the PST can therefore remove the only accessible copy of items that were never uploaded to a mailbox. If the contents matter, keep a separate copy and protect it from the same disk failure or account problem as the original.
OST: a synchronized offline copy
For Exchange, Microsoft 365, IMAP, and Outlook.com accounts, Outlook may use an OST. It is an offline synchronized copy of information held on the server. Microsoft explicitly says a separate OST backup is unnecessary because Outlook can download a fresh synchronized copy after the account is set up again.
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That statement does not guarantee identical retention or recovery for every organization. A work account may be subject to retention periods, litigation holds, mailbox quotas, administrator recovery policies, or deletion rules. Ask the administrator what is recoverable on the server before relying on re-synchronization.
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What the distinction means during a client switch
| Situation | Practical interpretation | Backup action |
|---|---|---|
| Messages are in a server-backed mailbox and visible after synchronization | The client is displaying a synchronized copy; the server remains the primary data source. | No separate OST backup is normally needed, but confirm organizational recovery and retention. |
| Messages exist only in a PST archive | The PST is a separate data source, not a guaranteed mailbox copy. | Copy the PST to another drive or approved cloud location. |
| A POP account stores mail in a PST | Local file handling may determine whether historical mail survives a switch. | Export or copy the PST before changing the account setup. |
| You need views, rules, or permissions preserved | Those are profile or configuration data, not all part of the message export. | Document and recreate them separately; do not rely on the PST alone. |
How to back up Outlook emails before switching
Classic Outlook’s built-in export creates a copy of selected data in a PST. It does not delete the source mailbox or move the original messages.
- Open the export wizard. In classic Outlook, select File > Open & Export > Import/Export.
- Choose an export. Select Export to a file, then continue.
- Select the file type. Choose Outlook Data File (.pst).
- Select the source. Choose the account, mailbox root, or individual folder you need to preserve. Select Include subfolders when nested folders are part of the backup.
- Choose a destination and filename. Save the PST somewhere with enough free space and a name that identifies the account and date.
- Finish the export. If prompted, choose whether to replace duplicates according to your backup plan.
- Add optional password protection. Classic Outlook can protect the PST with a password. A password is useful only if you can retrieve it later; Microsoft does not provide a way to bypass a forgotten PST password.
- Make a second copy. Microsoft recommends copying the completed file to a safe location such as a USB flash drive, another hard drive, or cloud storage.
- Verify the copy. Compare the file’s presence and size at both locations, then open the copy in a test Outlook profile or client when possible and inspect representative folders and date ranges.
Keep the original export until the new setup has been tested. A single PST on the computer you are replacing is not an independent backup.
Choose what to export deliberately
Exporting an entire mailbox is straightforward, but it can create a large file and include folders you do not need. Export only selected folders when the purpose is a focused archive, or select the mailbox root with subfolders when you need a broad historical copy. Contacts, calendar items, tasks, notes, and journal entries can be included when they reside in the selected Outlook data hierarchy.
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Microsoft says PST export omits metadata such as folder views, permissions, AutoArchive settings, message rules, and blocked senders. It is therefore a content export, not a complete Outlook profile backup. Write down these settings or capture screenshots before switching, then recreate and test them in the destination client.
Can new Outlook export or use a PST?
New Outlook now has an export path documented as Settings > Files > Export. The exact data types and controls can vary by installed version, so read the choices shown in your copy of new Outlook before starting. Microsoft’s feature pages and support instructions have changed over time; do not assume that an export option includes every item that classic Outlook can export.
Opening a PST separately in new Outlook
Opening a PST leaves it as a separate data source. The items remain in the PST rather than being silently merged into the mailbox. Microsoft’s instructions list all of these requirements:
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- Classic Outlook must also be installed.
- Both clients must use matching 32-bit or 64-bit architecture.
- The account used in new Outlook must have a Microsoft 365 subscription.
- New Outlook must be a non-ARM version.
- Safe mode and recovery mode are not supported for this workflow.
If one of these conditions is missing, the open-PST option may not work even though the file itself is valid. Matching architecture means 32-bit with 32-bit or 64-bit with 64-bit; it does not mean merely running both applications on the same Windows edition.
Importing selected PST content into a mailbox
Importing differs from opening. Microsoft’s import instructions describe selecting content from a PST and copying it into a destination mailbox. The source PST remains separate, so keep it until you have confirmed that the copied folders and items are complete.
Import only after the destination mailbox has enough space and the account is fully synchronized. For a large PST, copy a small representative folder first, confirm dates, attachments, categories, and folder placement, then perform the larger import. Do not delete the source file merely because the destination shows some of its messages.
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One-computer protection
For a short-term safety copy, export to PST and copy the result to a USB flash drive or another internal or external hard drive. Disconnect the removable copy after verification so malware, accidental deletion, or a failed computer cannot affect both copies at once.
Protection against hardware loss
Keep one PST copy on a different physical drive or in an approved cloud-storage location. Microsoft names another hard drive and cloud storage as possible destinations. Choose the location according to your organization’s security and retention requirements, especially if the PST contains personal, financial, health, or workplace information.
Work-account protection
For a server-backed work mailbox, ask the administrator about retention, legal holds, recovery points, and whether exporting mail is permitted. An OST can be downloaded again only while the server still retains the data and the account can access it.
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Long-term archive protection
Keep at least two readable copies of an important PST, label each with its creation date and source mailbox, and periodically open a copy to check that it is not corrupted. Store the password separately if the PST is protected. A forgotten password or an unverified file can turn an apparent backup into an unusable one.
Common switching mistakes and fixes
“My settings did not import.”
Confirm that classic Outlook had General > Store my Outlook settings in the cloud enabled before the first-run import, and restart classic Outlook after changing it. Then compare the missing item with Microsoft’s documented import list. If it is not listed, plan to configure it manually rather than repeating the import indefinitely.
“My rules disappeared.”
That result is consistent with Microsoft’s feature comparison, which lists rules import and export as unsupported in new Outlook. Record each rule’s conditions and actions in classic Outlook and recreate the necessary rules using the tools available in new Outlook, then send test messages to confirm behavior.
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Preference import may install a web-add-in counterpart, subject to administrator restrictions, but it does not make the original COM add-in run in new Outlook. Check whether the task has a supported web add-in and whether your organization allows it.
“The PST will not open.”
Check the five documented prerequisites: classic Outlook installed, matching 32-bit or 64-bit architecture, a Microsoft 365 subscription on the new Outlook account, a non-ARM build, and normal mode rather than Safe or Recovery mode. If any condition fails, use classic Outlook to inspect or export the file, or use the supported import path instead.
“I backed up the OST and still cannot find my old mail.”
An OST is not intended to be the portable archive. Set up the server-backed account again and allow synchronization. If messages were local-only, stored in a PST, deleted under a retention policy, or never uploaded, synchronization cannot recreate them; investigate the server, archive PSTs, and administrator recovery options.
“The PST copied successfully, but the new client looks different.”
That is expected when you used a content export. Folder views, permissions, AutoArchive settings, rules, and blocked senders are metadata that Microsoft says the export omits. Recreate those settings separately and test them with a low-risk mailbox or sample messages.
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- List every account and classify it as server-backed, POP, IMAP, Outlook.com, or another supported type.
- Locate every PST, including archives and files outside
DocumentsOutlook Files. - Enable General > Store my Outlook settings in the cloud in classic Outlook and restart it.
- Record rules, views, permissions, AutoArchive choices, blocked senders, and add-in-dependent tasks.
- Check Microsoft’s current feature comparison for the features you rely on.
- Export important folders to PST from classic Outlook, including subfolders where needed.
- Copy each completed PST to a second location such as a USB flash drive, another hard drive, or approved cloud storage.
- Verify that the copies can be opened and that representative messages, attachments, contacts, and calendar items are present.
- During new Outlook setup, choose the settings-import option and test the imported preferences.
- If using a PST in new Outlook, confirm the architecture, subscription, installation, build type, and operating mode requirements.
- Recreate unsupported metadata and rules, then test sending, receiving, filing, searching, and calendar workflows before retiring classic Outlook.
Which client and backup approach fits your situation?
| Your situation | Safest approach |
|---|---|
| You use a Microsoft 365 or Exchange mailbox with no local archives | Import the supported settings, verify the live feature matrix, and rely on server synchronization for the mailbox while confirming administrator recovery policies. |
| You maintain years of messages in archive PSTs | Make separate PST copies before switching; test whether your new Outlook build can open or import them under the documented requirements. |
| You use POP and your historical messages are local | Export or copy the PST before changing account settings. Do not assume a new account setup will download local-only mail. |
| You depend on complex rules, views, or COM add-ins | Stay with classic Outlook until each required function has a supported replacement and has passed a real-world test. |
| You need a portable archive rather than a synchronized mailbox | Use a PST and maintain independently stored copies, with access credentials and periodic readability checks. |
The reliable migration pattern is therefore selective settings import, explicit feature verification, and separate handling for PST data. New Outlook can be a suitable destination when your workflow fits its current support, but a successful mailbox sign-in alone is not evidence that every classic Outlook feature or local archive has moved.
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