"Size" column in Outlook 365

Dear @Michael Villanueva, 

Good day, and I appreciate the clear explanation of your concern. I understand you’re trying to add the “Size” column in New Outlook, but you can’t find the option. 

At this time, the New Outlook for Windows focuses on a streamlined set of features and the “Size” column isn't yet available in this experience. The ability to display a dedicated “Size” column continues to be supported in Classic Outlook, which offers more advanced view customization. As a result, some steps found in older documentation or community posts, which were designed for Classic Outlook, may not appear in the New Outlook interface. 

Here are some workarounds you can consider: 

Note: Since your post is tagged for the New Outlook app, the instructions above reflect that version. If you are using Classic Outlook instead, feel free to tell me and I will provide the exact steps.  

Option 1: Sort messages by size in New Outlook 

Although a dedicated “Size” column cannot be displayed, New Outlook does allow you to sort messages by size, which can help identify larger emails. 

• Open the folder you want to review, such as Inbox. 
• In the message list header, select the sort control. 
• Choose Size to sort emails by their message size. 

This organizes emails by size ranges and is currently the closest alternative to viewing a Size column in New Outlook. 

Option 2: Use Classic Outlook to display the Size column 

If having a visible “Size” column is essential for your workflow, Classic Outlook remains the supported option. 

Steps to switch back: 

Note: This option is only available if Classic Outlook is available and not restricted by organizational policies. 

• In New Outlook, select the toggle to return to Classic Outlook or go to Help tab > Go to classic Outlook.  

Steps to add the Size column in Classic Outlook: 

• Open Classic Outlook. 
• Go to the View tab. 
• Select Change View and choose a list style such as Single or Preview. 

• Go to View, then View Settings, and select Columns. 
• From the available columns list, select Size. 
• Select Add, then OK to apply the change. 

I completely understand how these limitations in the new Outlook can feel disruptive. It’s not just about aesthetics; these differences can genuinely affect how smoothly you work and navigate your day. 

I’m really sorry, I know this isn’t the outcome you were hoping for. As a forum moderator, I hope you understand that I don’t have the ability to modify or escalate product issues directly. However, I strongly recommend submitting your feedback through the Outlook (new) · Community portal. This is the most effective way to ensure your voice reaches the product team and can be considered for future improvements.  

Once you've submitted your feedback, feel free to share the link here in the comments. I’ll be happy to upvote it to help bring more visibility. If you prefer, I can also submit this great idea on your behalf. Just let me know, and I’ll post it for you and share the link once it’s published. I’m here to help ensure your feedback gets the attention it deserves. 

Additionally, as other users have raised similar concerns and may not be aware of where to share their feedback, I hope this response helps clarify the situation and suggests a potential next step. Highlighting this information can make it more visible to others in the community who may be facing the same issue, making it easier for them to find guidance and contribute their feedback as well. 

Thank you again for your time and for raising this important usability concern. 

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In New Outlook for Windows, adding custom columns like Size to the message list is currently not supported.

What can be done instead in New Outlook:

• To sort by size, use the sort control at the top of the message list:
  1. Open the Inbox in New Outlook.
  2. Click the up/down arrows at the top right of the message list.
  3. Choose Size to group and sort messages by size (e.g., Small, Medium, Large).

To have a visible Size column, switch back to Classic Outlook, which supports full column customization:

1. In Classic Outlook, switch to a list view if needed:
   • Select View > Change View > Single or Preview.
2. Add the Size column:
   • On the View tab, in Current View, select View Settings.
   • Select Columns.
   • In Available columns, choose Size and select Add.
   • Select OK to apply.

New Outlook does not yet provide the same column customization as Classic Outlook, so the Size column itself cannot be added there.

References:

• Add or remove columns in the Inbox
• How can I sort my emails by size? - Microsoft Q&A