The Outlook Cleanup Checklist

Outlook splits incoming mail into Focused and Other. Other is where Microsoft routes promotions, newsletters, and bulk mail by default — anything older than a year here is rarely useful.

On most Microsoft 365 accounts the Other tab holds the majority of inbox volume.

Sweep is Outlook's under-used bulk action. Right-click a sender, choose Sweep, then "Always delete all" or "Always delete older than 10 days". Clears history AND future emails in one action — no inbox rule plumbing required.

A single Sweep on a daily-newsletter sender can clear thousands of emails.

Outlook keeps Junk for 30 days, but the folder still counts toward your Microsoft 365 or Outlook.com mailbox quota. Right-click Junk Email > Empty folder once a quarter.

Also affects shared OneDrive/365 quota — full mailbox blocks new mail and Teams attachments.

If you have not opened a newsletter in 3 months, you are never going to. Outlook surfaces an Unsubscribe link near the sender for senders that include the List-Unsubscribe header (RFC 8058). Walk through Other and Junk — that is where stale subscriptions accumulate.

Prioritize high-frequency senders (daily or weekly emails).

Click the "From" column header to group by sender, identify the top 5 noisy ones, then right-click each and choose "Find all from sender" → select all → Delete. Works the same in Outlook desktop and Outlook Web.

Repeat for each of your top 5 junk senders.

After the bulk deletes, items sit in Deleted Items — Outlook does not auto-empty. Right-click Deleted Items > "Empty folder" to clear them, OR enable Settings > Mail > Message handling > "Empty deleted items folder when signing out".

Storage is not reclaimed until Deleted Items is emptied.

Outlook has a dedicated Archive folder — emails moved there are removed from the inbox but remain searchable. Use the Archive toolbar button, or set up Sweep > "Move older than 30 days to Archive" so it runs continuously.

Archive is the safer alternative to Delete for emails you might want later.

Settings > Mail > Rules > Add new rule. Condition: Subject contains "invoice" OR "receipt" OR "your order" OR "order confirmation". Action: Categorize as "Receipts" and Move to a Receipts folder. Future receipts arrive pre-filed.

Combine with the Categories system to colour-code receipts at a glance.

Open a thread you are merely CC'd on, then click Ignore (Home toolbar) or press Ctrl+Del. Outlook moves the current thread AND all future replies to Deleted Items automatically — far more aggressive than Gmail's mute.

Reversible — undo Ignore from the Deleted Items folder if needed.