How to Delete Attachments in Outlook on a Mac in 2026: 2 Ways

To delete an attachment in Microsoft Outlook on a Mac, either send yourself a copy of the email without the file and delete the original, or delete the whole email and empty Deleted Items. Only legacy Outlook for Mac has a Remove command, and it no longer connects to Microsoft 365 or Outlook.com mailboxes.

Usually this search starts with a "mailbox almost full" warning, or a message with a huge file you never want to see again, and then the menu next to the attachment offers no way to get rid of it. That missing button isn't you. This guide covers both ways that work, how to find the emails worth clearing, and which kind of space each one actually frees.

Why can't I remove an attachment in new Outlook for Mac?

New Outlook for Mac has no command for removing an attachment from an email you've received. Microsoft's guide to viewing and saving attachments on a Mac lists Preview, Open and Download for the current app, and gives Remove only under legacy Outlook. A Microsoft Community support agent confirmed the gap in January 2025, and I haven't found a Microsoft announcement since that adds it.

Microsoft's own page on removing attachments has no Mac tab at all. It says the same about new Outlook, Outlook.com and the web version: to get rid of a received file, delete the email it came with. Its Outlook.com storage page puts it flatly: to delete the file, "you must delete the message it's attached to." So the two ways below are the real options, not a stopgap while you hunt for a setting.

Way 1: Keep the email and delete only the file

Keeping the email without its attachment takes a copy in new Outlook for Mac, one menu click in legacy Outlook, and a detour through Apple Mail for some personal accounts. Before any of them, save the file somewhere you'll find it. I once stripped a deck from a client thread and needed it again before lunch, so now the download always comes first.

In new Outlook for Mac: send yourself a copy

This is the workaround Microsoft's support agent suggests:

1. Open the email, click the drop-down arrow next to the file and choose Download, or Download All if there are several (Microsoft's steps). Pick a folder in Finder.
2. Press Command-R to reply. Replying rather than forwarding leaves the file behind; if a file does show up in the draft, use the arrow beside it to remove it.
3. Replace the To address with your own and press Command-Return to send.
4. When the copy arrives, move it to the folder where the original lived.
5. Delete the original, then delete it again from Deleted Items so the space comes back.

There's one real cost. As one user pointed out in a Microsoft thread, the copy is from you, so searching for the original sender's name in the From field won't turn it up later. When I make one of these copies, I type the sender and date into the subject line, which keeps it findable: "Lease renewal (from the landlord, March 2026)". Skip this route for anything you might have to prove later, like a signed contract or an approval. Keep those originals, file and all.

In legacy Outlook for Mac: use Remove

Legacy Outlook for Mac still has the command. In a received message, select the drop-down arrow next to the file and choose **Remove**. Save the file first with Save As, since the same menu has it.

Whether you can use legacy Outlook depends on the account. Microsoft's end-of-support page set October 2026 as the month legacy Outlook stops working with Exchange Online mailboxes and support ends for Microsoft 365 Personal and Family. A Microsoft MVP, an independent expert rather than a Microsoft employee, adds that Outlook.com accounts are affected too, while Gmail can carry on. Support for on-premises Exchange and Office LTSC 2024 runs until October 9, 2029.

If your setup qualifies and you're in new Outlook, a community answer points to Help > Revert to Legacy Outlook. That isn't a Microsoft-documented step, and the option doesn't appear for everyone. I wouldn't build a cleanup habit on an app with an end date printed on it.

In Apple Mail: Remove Attachments, for an account using IMAP

Mail, the app built into macOS, has the command Outlook dropped. Apple's Mail guide says to select the message and choose Message > Remove Attachments. The message stays in your mailbox, marked to show the attachments were removed by hand, and for IMAP accounts they're deleted from the mail server too, with no way to get them back.

A personal Outlook.com address can connect over IMAP, the standard way mail apps sync with a server, which is off by default: turn it on in Outlook.com under Settings > Mail > Forwarding and IMAP, then add the account to Mail. Microsoft doesn't say how its servers handle an attachment removed this way, though, so try it on one unimportant email and check the result in Outlook on the web before touching anything else. Work accounts are a poor fit: Apple warns that Mail on macOS may stop syncing with Exchange from October 2026, as I cover in Apple Mail vs. Outlook.

Way 2: Delete the whole email

Deleting the email is Microsoft's own answer for new Outlook and its web versions, and it's the one that frees space fastest. The file goes with the message, so there's nothing left to manage. Most of what fills a mailbox doesn't deserve a slim copy anyway: old exports, forwarded decks, photos of a whiteboard.

1. Download anything you want to keep (the arrow next to the file, then Download or Download All).
2. Select the email in your inbox or subfolder. For a file you sent, go to Sent Items, because your sent copy holds its own attachment.
3. Press Delete.
4. Open Deleted Items, select the email and delete it there too.

To skip the last step, select the email and press Shift-Delete, which Microsoft lists as permanently delete in Outlook for Mac. Make sure you've saved the file first.

Deleting only touches your own mailbox. Everyone you sent the file to keeps their copy. If that's the real problem, unsending or recalling the email is the thing to look at, and it only works in narrow cases.

How to find the biggest attachments in Outlook for Mac

The fastest way to find what's filling an Outlook mailbox on a Mac is to show only emails with attachments, then sort by size. Going through messages one at a time wastes an afternoon; when my mailbox warning came up, a handful of old threads with video files turned out to be most of the problem.

• Show only emails with attachments. In the search box, type HasAttachment:yes with no space after the colon. You can add a word to narrow it, such as report HasAttachment:yes. The Filters icon inside the search box has an attachments option as well.
• Sort by size in new Outlook for Mac. Microsoft's support agent suggests sorting by message size, largest first, with the attachments filter on. Look for the sort control above the message list; Microsoft doesn't publish Mac-specific steps for it, so the label may differ in your version.
• Sort by size in Outlook on the web. Sign in from Safari and use **Filter** > **Sort by** > **Size**. Choose Size again if the smallest messages come first.
• Sort in legacy Outlook. Use **Organize** > **Arrange By**, or Home > Filter for attachments.

Check Sent Items and Archive too. In my experience the biggest files often turn out to be ones I sent myself.

For a bulk cleanup, the browser is the better tool. In Outlook on the web, **Settings** > **Account** > **Storage** shows the space each folder uses, and it can permanently delete everything in a folder, or only items older than 3, 6 or 12 months. That setting removes whole emails, so use it on folders you've already decided you don't need.

Does deleting Outlook attachments free up space on my Mac?

Deleting Outlook attachments mainly frees mailbox space on Microsoft's servers, and may not change your Mac's free disk space much. Those are two separate problems, and it's worth knowing which one you have before deleting anything.

If Outlook says your mailbox is full

Your limit depends on the account. Work and school mailboxes can have up to 100 GB, and an admin can set less. Go over and mail stops moving in both directions. Free Outlook.com is trickier: you get a 15 GB mailbox plus 5 GB of Microsoft cloud storage, and attachments count against the 5 GB, along with your OneDrive files and photos. Fill that smaller pool and Outlook.com stops sending and receiving, even with room left in the mailbox. So for a free account, attachments are usually the first thing to clear.

If your Mac's disk is full

The files you've chosen to download land wherever you saved them, often your Downloads folder, and Outlook's cleanup won't touch those. Clear them in Finder yourself.

Outlook also keeps a local copy of your account. Microsoft's way to rebuild it is **Tools** > **Accounts**, select the account, then **Manage** > **Reset Account**, with your Mac online. Two caveats: Microsoft documents this as a fix for sync problems rather than a way to save space, and it warns that anything not yet synced with the server is deleted. Mail left on the server downloads again.

You'll also see guides pointing to an Outlook Temp folder under ~/Library/Caches/TemporaryItems, reached with Go > Go to Folder in Finder. That location varies by version, and I couldn't find Microsoft documenting it for the current app. Deleting those files doesn't change your mailbox, and I wouldn't touch anything else in Outlook's Library folders without a backup. Cleaner apps that scan your Mac's files work on local copies too, so they won't clear a "mailbox full" warning either. The same split applies if you use Apple's app, which I go through in clearing the Mail cache on a Mac.

Attachment menu grayed out or missing in Outlook for Mac

A missing Remove in the attachment menu usually means you're in new Outlook, while a grayed-out menu points to a bug. Try these, top down:

1. Check which Outlook you have. Legacy Outlook shows a Legacy Outlook switch near the top of its window. If Remove is missing and there's no such switch, you're in new Outlook, and Way 1's copy method is your route.
2. Update Outlook. Use **Help** > **Check for Updates**. In late 2024, users on version 16.90.2 reported every attachment option grayed out, and one reported a later build fixed it.
3. Check whether it's a draft. Removing a file from an unsent email is different: in the draft, open the arrow beside the file and choose **Remove attachment**.
4. Try Outlook on the web. If it behaves the same way there, the limit is the product rather than your Mac. If it's only one mailbox, check with IT about any retention policy on it.

How to stop Outlook attachments piling up

Fewer files in Outlook comes down to a few habits, since new Outlook for Mac won't let you tidy up afterward.

• Send links instead of files. A OneDrive or SharePoint link adds almost nothing to your mailbox or anyone else's, and everyone sees the latest version. I only attach a file now when the recipient needs a frozen copy, such as a signed PDF.
• File attachments as they arrive. When a contract or invoice lands, I download it to its project folder right then and treat the email as a receipt. Then the email can go whenever it needs to.
• Empty Deleted Items on a schedule. A monthly reminder beats finding out from a bounce.
• Watch the warning, not the limit. Microsoft sends warnings as you near the limit. Clean up at the first one rather than the day a client tells you their email bounced.

If the missing Remove command is the last straw, there are other apps. I compared seven in Outlook alternatives for Mac.