How to Set Up Auto-Archive in Outlook

Microsoft Outlook’s AutoArchive feature automatically moves old emails, calendar items, and tasks to a separate archive file, keeping your mailbox lean and Outlook running fast. Whether you use classic Outlook on desktop or Microsoft 365, archiving prevents your inbox from growing beyond manageable size. For more ways to keep your inbox organized, see our guide to setting up Outlook rules.

Key Takeaways

• Outlook AutoArchive moves items older than a set number of days to a local .pst file, reducing mailbox size and improving performance.
• AutoArchive is configured under File > Options > Advanced > AutoArchive Settings in classic Outlook — it is not available in the new Outlook for Windows.
• Archived emails are stored in a .pst file at C:\Users\{username}\Documents\Outlook Files\archive.pst by default.

How Do I Set Up AutoArchive in Outlook?

Open Outlook, go to File > Options > Advanced, click AutoArchive Settings, and configure the run frequency and item aging period to start automatic archiving.

Step 1: Open AutoArchive Settings

1. Open Microsoft Outlook (classic desktop version).
2. Click File > Options.
3. Select Advanced from the left sidebar.
4. Under the AutoArchive section, click AutoArchive Settings.

Step 2: Enable and Configure AutoArchive

In the AutoArchive dialog box, configure these settings:

1. Check the box for Run AutoArchive every ___ days and set your preferred interval (e.g., 14 days).
2. Check or uncheck Prompt before AutoArchive runs depending on whether you want a notification before each run.
3. Under Default folder settings for archiving, set Clean out items older than to your preferred aging period (e.g., 6 months).
4. Choose the action for old items:
5. Move old items to: Select this and specify the archive .pst file path.
6. Permanently delete old items: Select this only if you want items removed entirely.
7. Click OK to save, then click OK again to close Options.

Recommended AutoArchive Settings

Setting	Recommended Value	Why
Run frequency	Every 14 days	Balances performance without being intrusive
Prompt before run	Yes	Lets you review before items are moved
Clean out items older than	6 months	Keeps recent items accessible
Move old items to	Default archive.pst	Keeps items recoverable
Delete expired items	Only mail folders	Prevents calendar/contact loss

According to Microsoft Support, you can set aging periods from 1 day up to 60 months, giving you precise control over what gets archived and when.

How Do I Set AutoArchive for Individual Folders?

You can override the global AutoArchive settings on a per-folder basis — for example, archiving your Inbox after 3 months but your Sent Items after 12 months.

1. Right-click the folder you want to customize (e.g., Inbox).
2. Select Properties.
3. Click the AutoArchive tab.
4. Select Archive this folder using these settings.
5. Set the aging period (e.g., Clean out items older than 3 months).
6. Choose whether to move items to the default archive file or a different .pst file.
7. Click OK.

Per-folder settings always take priority over the global AutoArchive configuration. This lets you keep important folders like Contacts and Calendar on longer retention while aggressively archiving high-volume folders like Inbox and Sent Items.

How Do I Archive Emails Manually in Outlook?

Use the manual archive option to archive emails on demand without waiting for the AutoArchive schedule — useful for one-time cleanup or when you need immediate mailbox space.

Method 1: Clean Up Old Items

1. Click File > Info.
2. Click Tools > Clean Up Old Items.
3. Select Archive this folder and all subfolders and choose the folder.
4. Set the Archive items older than date.
5. Choose the archive .pst file location.
6. Click OK to start archiving.

Method 2: Quick Archive (Backspace Key)

In newer versions of classic Outlook, select one or more emails and press the Backspace key (or click the Archive button in the ribbon). This moves them to the Archive folder immediately.

The quick archive method moves emails to the built-in Archive folder within your mailbox — it does not create a separate .pst file and does not reduce your mailbox size on the server.

What Is the Difference Between Archive and Delete in Outlook?

Archiving moves emails to a separate storage location where they remain indefinitely — deleting sends emails to the Deleted Items folder where they are automatically purged after a retention period.

Action	Where Items Go	Retention	Recoverable?	Frees Mailbox Space?
Archive (AutoArchive)	Local .pst file	Indefinite	Yes, from .pst	Yes (moved off server)
Archive (button/Backspace)	Archive folder in mailbox	Indefinite	Yes, in folder	No (still in mailbox)
Delete	Deleted Items folder	14-30 days	Limited window	Yes, after purge
Permanently delete (Shift+Del)	Recoverable Items	14 days (Exchange)	Very limited	Yes, immediately

Key distinction: AutoArchive to a .pst file genuinely frees server mailbox space because items are moved to a local file. The Archive button merely moves items to a different folder within the same mailbox — your mailbox size stays the same. According to Microsoft Support, the Archive folder is never automatically emptied, unlike Deleted Items.

Where Are Archived Emails Stored in Outlook?

AutoArchive stores emails in a local .pst file on your computer — the default location is C:\Users\{username}\Documents\Outlook Files\archive.pst on Windows.

Default Archive File Locations

Windows Version	Default Path
Windows 10/11	C:\Users\{username}\Documents\Outlook Files\archive.pst
Older Windows	C:\Users\{username}\AppData\Local\Microsoft\Outlook\archive.pst

How to Change the Archive File Location

1. Open AutoArchive Settings (File > Options > Advanced > AutoArchive Settings).
2. Click Browse next to the Move old items to field.
3. Navigate to your preferred location (e.g., an external drive or network folder).
4. Click OK.

How to Open an Existing Archive File

If you need to access previously archived emails:

1. Click File > Open & Export > Open Outlook Data File.
2. Navigate to your archive .pst file.
3. Click Open. The archive appears as a separate folder in your Outlook sidebar.

Back up your archive .pst files regularly — if the file becomes corrupted or the drive fails, archived emails cannot be recovered from the mail server.

Can I Set Up Auto-Archive in Outlook 365 or the New Outlook?

AutoArchive is not available in the new Outlook for Windows or Outlook on the web — these versions use the Online Archive feature for Microsoft 365 enterprise accounts instead.

Classic Outlook (Recommended for AutoArchive)

AutoArchive works fully in classic Outlook desktop (Outlook 2016, 2019, 2021, 2024, and the classic Microsoft 365 Outlook). If you are using the new Outlook for Windows and need AutoArchive, switch back by toggling Try the new Outlook off in the top-right corner.

Online Archive (Microsoft 365 Enterprise)

For organizations with Microsoft 365 E3, E5, or Exchange Online Plan 2, the Online Archive provides server-side archiving:

• Separate archive mailbox with its own folder structure
• Actually frees primary mailbox space (unlike the Archive folder)
• Managed by IT administrators through retention policies
• Not the same as the AutoArchive .pst feature

If your organization uses Microsoft 365 and you need Outlook with full desktop features, Microsoft Office 2024 Professional Plus ($199.99) includes the classic Outlook application with AutoArchive support.

How Do I Manage Outlook Mailbox Size Without Archiving?

If you prefer not to use AutoArchive, Outlook offers other ways to reduce mailbox size and keep performance fast.

• Rules: Automatically move emails to folders or delete them based on sender, subject, or keywords. See our Outlook rules setup guide for details.
• Cleanup tool: File > Info > Tools > Mailbox Cleanup shows your mailbox size and lets you find large items.
• Empty Deleted Items on exit: File > Options > Advanced > check Empty Deleted Items folders when leaving Outlook.
• Compact .pst files: Right-click any data file in Account Settings > Data Files > Settings > Compact Now.
• Automatic replies: Set up out-of-office replies to manage expectations while you clean up your inbox.

Frequently Asked Questions

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