New Outlook - Email not sent / delayed when choosing "Share as attachment" from application

Question

New Outlook - Email not sent / delayed when choosing "Share as attachment" from application

Inger Christensen 55

If we use the File \ Share \ Email \ Send as Attachment. The email is not sent until we open Classic Outlook. Tried changing all the Settings \ Apps \ Default to New Outlook and it still opens the window to Classic Outlook. The finding is that the email is place in the Classic Outlook Outbox and it is sent if I open Classic Outlook. If the user only use New Outlook the email remains in the Outbox for Classic Outlook / or in some cases sent later. For the users who experiencing that it is sent days later, it is unconfirmed if the user has opened Classic Outlook at that point.

Question: Anyone know if the will this be fixed soon? I have only been able to find that other people have reported it, but cannot find anything in the Feedback log, nor in the O365 roadmap and was suggested to open my own thread.

Question: Is there a way to disable send the attachment from within Word, Excel, PowerPoint to ensure that the user does it directly by creating a new email in New Outlook to ensure it is sends the email right away?

Tagged as Microsoft 365 and Office, and other as Outlook is not part of the list and the tag Outlook, with Windows as a child is not working.

Share_Send as Attachment

Classic Outlook dialog is opened.

Mail dialog

Moved from Microsoft 365 and Office | Other

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Answer 1

Kal-D 7,380 Microsoft External Staff Moderator

Hi Inger Christensen,

Welcome to Microsoft Q&A.

Thanks for sending the details and screenshots — that really helps me a lot.

This behavior matches how Office “Send as Attachment” works today: Word/Excel/PowerPoint use the legacy Windows mail handoff (MAPI), which Classic Outlook supports. New Outlook is essentially a web-based app (PWA) and doesn’t support that same local handoff, so Office routes the action through Classic Outlook instead.

Quick heads-up: If the message is created in Classic Outlook, it will sit in Classic Outlook’s Outbox and won’t send until Classic Outlook is opened. It’s easy to assume it’ll send in the background, which can explain the “days later” timing.

Workaround for New Outlook users: Start the message in New Outlook, then attach the file (Attach button or drag & drop).

Tip: Attach the file using the Attach button or by dragging it in from File Explorer or OneDrive. Or, if it fits your workflow, use Office “Send a link” instead of “Send as attachment.”

Please let me know if this proves useful to you, or if you would like further assistance.

I'm looking forward to your reply.

Inger Christensen 55 Reputation points

2026-02-05T15:10:56.26+00:00

Thanks for your reply. I am aware of the option to attach directly in Outlook and also recommend to share link rather than attach a file, but in some cases they prefer an attachment. My concern is that the option is available within the application and if something is available then it should work.

Is there a way for IT to disable the option 'Send the attachment' from within Word, Excel, PowerPoint to ensure that users do not try to use the feature?
Kal-D 7,380 Reputation points Microsoft External Staff Moderator

2026-02-05T17:01:07.76+00:00

Hi Inger Christensen,

Thanks for checking back — I completely understand the concern. Unfortunately, at the moment, there isn’t an end‑user setting in Word/Excel/PowerPoint to remove or change how Send as Attachment works. That button still uses the legacy Windows mail handoff (MAPI), which is only supported by Classic Outlook, so messages sent through that option won’t use new Outlook’s sending pipeline.

In managed environments, IT administrators can hide or disable specific Office ribbon commands through policy or customization tools. However, there isn’t a built‑in “Disable Send as Attachment” toggle, so admins typically need to identify and test the specific command ID before deploying a policy.

For now, the most reliable approach is to compose the email directly in new Outlook and attach the file from there or use Share > Send a link when that fits the workflow.
Inger Christensen 55 Reputation points

2026-02-12T12:12:06.9333333+00:00

Your tip - "You can often drag the file icon/name from the Word title bar straight into a New Outlook message to attach it faster".

I just tried and I cannot get this functionality to work; I tried both from Word App and Word Web. I also tried from within Teams under 'Documents'. The only drag and drop which seem to work is a file from my OneDrive.

Can you please provide a screendump of the functionality you are describing?
Kal-D 7,380 Reputation points Microsoft External Staff Moderator

2026-02-12T15:46:01.5233333+00:00
Hi Inger Christensen,

Thanks for following up and for testing this further. I appreciate you calling it out.

To clarify: dragging a file from the Word title bar into new Outlook isn’t a formally supported scenario, and results can vary depending on the app surface and file location. In practice, new Outlook only reliably supports drag‑and‑drop when the drag source is a file system or OneDrive file (for example, from File Explorer or a synced OneDrive folder).

Dragging from Word for the web, Teams > Documents, or the Word app title bar may not work consistently, and that behavior isn’t currently documented or guaranteed.

For the most predictable experience in new Outlook, the recommended options remain:

Start the message directly in new Outlook, then use Attach file, or

Drag the file in from File Explorer or OneDrive, or

Use Share > Send a link when that fits the workflow.

Thanks again for helping validate the behavior. Feedback like this is useful for keeping guidance accurate.