Attachment Issues

Fix Outlook Email Cannot Be Added to Microsoft To Do Task

Maira Mehtab Sep 22, 2026 869 views

Question details

The user is unable to manually add or drag certain Outlook Classic emails into the file section of a Microsoft To Do task.

Product: Microsoft Outlook and Microsoft To Do
Device & OS: not provided
Scenario: Attempting to attach or drag-and-drop an Outlook email into a Microsoft To Do task as a file attachment.
Observed behavior: Some emails fail to be added to the task, while other messages and emails with attachments process normally.

Before you start

Ensure that both your Microsoft Outlook and Microsoft To Do applications are updated to their latest versions and that you are logged into the same Microsoft account on both platforms.

Solution 1Recommended

Remove Unsupported Characters from the Email Subject

Rename the email subject line to remove parentheses or other special characters that prevent the email from being attached to Microsoft To Do.

Microsoft To Do's attachment system can sometimes fail to process files or emails if their titles contain unsupported special characters. In many cases, parentheses (), brackets [], or irregular punctuation marks in an Outlook email subject line will break the drag-and-drop functionality.

Open the specific email

In Outlook Classic, locate the email message that is failing to attach and double-click to open it in a separate, dedicated window.

Edit the subject line

Click directly into the subject line of the email. Delete any parentheses, special symbols, or unusual formatting.

Save the email

Press Ctrl + S or click the Save icon in the top left corner to save the updated subject line to the email.

Drag and drop to To Do

Close the email window and attempt to drag the renamed email from your inbox directly into the file attachment section of your Microsoft To Do task again.

Best Practice: Keep email subjects concise and alphanumeric when you plan to use them as task attachments to prevent cross-app syncing errors.

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Frequently Asked Questions

Why do some Outlook emails drag and drop to Microsoft To Do while others do not?

This is usually caused by unsupported special characters in the email's subject line. Characters like parentheses or slashes can disrupt the file naming process when the email is converted into a .msg attachment for Microsoft To Do.

Can I attach emails to Microsoft To Do using Outlook on the web?

Yes. If you use Outlook on the web, you can easily create tasks from emails by dragging the email to the 'My Day' side pane, which links the task directly to the original email without dealing with file attachment limitations.

What characters should I avoid in email subjects to prevent attachment errors?

To ensure smooth integration across Microsoft apps, it is best to avoid characters like parentheses (), square brackets [], forward slashes (/), backslashes (\), and asterisks (*) in the subject lines of emails you intend to save as files.

Outlook & Email Problems