how to reply email with attachment in outlook 365

How to Reply to an Email with Attachment in Outlook 365

Outlook 365 is a popular email client used by millions of individuals and businesses around the world. One of its key features is the ability to send and receive email attachments, allowing users to easily share files and documents with others. In this article, we will explore how to reply to an email with an attachment in Outlook 365, providing step-by-step instructions and valuable insights to help you make the most of this powerful tool.

Step 1: Open the Email

The first step in replying to an email with an attachment in Outlook 365 is to open the email you wish to reply to. Simply click on the email in your inbox to open it in a new window or tab.

Step 2: Click on the Reply Button

Once you have opened the email, you will see a toolbar at the top of the window with various options. Look for the “Reply” button and click on it. This will open a new email window with the original email included as part of the reply.

Step 3: Attach the File

Now that you have opened the reply email window, it’s time to attach the file you want to include in your reply. To do this, click on the “Attach File” button, which is usually represented by a paperclip icon. This will open a file explorer window where you can browse your computer for the file you want to attach.

Once you have located the file, select it and click on the “Attach” button. The file will then be attached to your reply email.

Step 4: Compose Your Reply

With the file attached, you can now compose your reply email. Type your response in the body of the email, just as you would with any other email. You can also format the text, add images, or include hyperlinks if desired.

Step 5: Send Your Reply

Once you have composed your reply, it’s time to send it. Look for the “Send” button, usually located in the toolbar at the top of the email window, and click on it. Your reply email, along with the attached file, will then be sent to the recipient.

Best Practices for Replying to Emails with Attachments

While the process of replying to an email with an attachment in Outlook 365 is relatively straightforward, there are a few best practices you can follow to ensure a smooth and efficient experience. Here are some tips to keep in mind:

1. Keep the File Size in Check

When attaching files to your reply email, it’s important to consider the file size. Large attachments can take a long time to upload and download, causing delays for both you and the recipient. If possible, try to compress the file or use a file-sharing service to send larger files.

2. Use Descriptive File Names

When attaching files, it’s helpful to use descriptive file names that clearly indicate the content of the file. This makes it easier for the recipient to understand what the attachment is without having to open it. For example, instead of naming a file “Document1.docx,” consider using a name like “Quarterly Sales Report Q3 2021.docx.”

3. Provide Context in Your Reply

When replying to an email with an attachment, it’s important to provide context in your reply. Explain why you are sending the attachment and how it relates to the original email. This helps the recipient understand the purpose of the attachment and ensures that they have all the necessary information.

4. Confirm Receipt of the Attachment

When sending an email with an attachment, it’s a good practice to confirm receipt of the attachment in your reply. This lets the sender know that you have received the file successfully and can proceed with any necessary actions. You can simply include a brief sentence like “I have received the attachment, thank you” in your reply.

5. Follow Email Etiquette

Lastly, it’s important to follow email etiquette when replying to emails with attachments. This includes using a professional tone, being concise and clear in your communication, and avoiding unnecessary attachments or large email threads. Remember that email is a professional communication tool, and it’s important to use it appropriately.


Q: Can I attach multiple files to my reply email?

A: Yes, you can attach multiple files to your reply email in Outlook 365. Simply repeat the process of clicking on the “Attach File” button and selecting the files you want to attach. You can attach as many files as you need, as long as they do not exceed the maximum file size allowed by your email provider.

Q: What file types can I attach to my reply email?

A: Outlook 365 supports a wide range of file types for attachments, including documents, images, videos, and more. Some common file types that can be attached include .docx, .xlsx, .pdf, .jpg, and .mp4. However, it’s important to note that certain file types may be blocked by your email provider for security reasons.

Q: Can I preview the attachment before sending my reply?

A: Yes, Outlook 365 allows you to preview attachments before sending your reply. Simply click on the attachment in the email window, and a preview of the file will be displayed. This allows you to verify that the correct file has been attached and ensure that it is the intended attachment.

Q: Can I remove an attachment from my reply email?

A: Yes, you can remove an attachment from your reply email in Outlook 365. To do this, simply click on the attachment in the email window and press the “Delete” or “Backspace” key on your keyboard. The attachment will then be removed from your reply email.


Replying to an email with an attachment in Outlook 365 is a simple and straightforward process. By following the steps outlined in this article and keeping best practices in mind, you can effectively send and receive emails with attachments, enhancing your communication and collaboration with others. Remember to consider file sizes, use descriptive file names, provide context in your replies, confirm receipt of attachments, and follow email etiquette. By doing so, you can make the most of Outlook 365’s powerful features and streamline your email communication.


I am a technology writer specialize in mobile tech and gadgets. I have been covering the mobile industry for over 5 years and have watched the rapid evolution of smartphones and apps. My specialty is smartphone reviews and comparisons. I thoroughly tests each device's hardware, software, camera, battery life, and other key features. I provide in-depth, unbiased reviews to help readers determine which mobile gadgets best fit their needs and budgets.

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