How to Archive Old Emails in Outlook

Archiving moves old emails out of your inbox without deleting them — they stay fully searchable, just out of the way. It’s the safe middle ground between a cluttered inbox and hitting delete. Here’s how to archive in every version of Outlook, and how to decide what to archive versus clear.

Archive vs delete: which should you use?

Archive — keep it, but get it out of the inbox. Great for receipts, past projects, and anything you might reference later.
Delete — you’ll never need it (most newsletters, notifications, promos). Deleting also frees up quota, which archiving to the same mailbox may not.

A good rule: archive what you’d miss, delete what you won’t.

Method 1: The Archive button (Outlook.com & new Outlook)

Select one or more emails (Ctrl+click, or Ctrl+A for all in a folder).
Click Archive in the toolbar (or press the Backspace key).
They move to the Archive folder — still searchable anytime.

To archive in bulk, sort or search first, then select all and archive.

Method 2: Auto-Archive (classic Outlook desktop)

Classic Outlook can archive old mail automatically to a local .pst file, which also frees space on the server:

File → Options → Advanced → AutoArchive Settings.
Set how often it runs and how old items must be (e.g. older than 6 months).
Choose to move them to an archive .pst or delete them.

You can also archive on demand: File → Tools → Clean Up Old Items.

Method 3: Online Archive (Microsoft 365 / work accounts)

Many work accounts include an Online Archive — a separate, large archive mailbox that appears in your folder list. Drag mail into it, or your admin may set a policy to move old items there automatically. It’s ideal when your primary mailbox is near its quota.

Decide what to archive vs clear — fast

The slow part isn’t archiving; it’s deciding, message by message, what’s worth keeping. A per-sender view makes it obvious: entire senders (newsletters, alerts) can be cleared outright, while a few senders are worth archiving.

Sender Sweep ranks every sender by volume and shows how many of their emails you’ve actually read, so you can archive or delete whole senders at once instead of triaging individually — and reclaim inbox space in minutes, all in your browser.

FAQ

Does archiving free up mailbox space? Sometimes. Archiving to a local .pst or an Online Archive frees space in your primary mailbox; archiving within the same mailbox mainly declutters the inbox. To truly free quota, delete what you don’t need — see Outlook mailbox full? How to free up space.

Can I find archived emails later? Yes — they stay fully searchable in the Archive folder (or archive mailbox).

What’s the difference between Archive and Deleted Items? Archive is long-term storage you chose to keep; Deleted Items is a temporary holding folder that gets purged.