---
title: "How to Find Out the Size of Your Mailbox"
url: https://lookeen.com/blog/how-to-find-out-the-size-of-your-mailbox
lang: en
description: "Do you know how large your Outlook mailbox is? Rather than trying to just guess its size, have it displayed quickly instead!"
author: "Fiona Allan"
published: 2012-01-11T07:43:57+00:00
modified: 2026-11-11T07:07:50+00:00
---

# How to Find Out the Size of Your Mailbox

![Do you know the size of your Outlook mailbox?](https://lookeen.com/wp-content/uploads/2012/01/Datendateieigenschaften1.jpg)

To be able to clean up and know when emails absolutely must be deleted quickly, it is very helpful to know the size of your own mailbox. How do you find out? Very easily.

1.  Open Outlook.
2.  Open the folder view where your **Inbox**, **Sent Items**, etc. are displayed.
3.  Right-click on **Personal Folders**.
4.  Click on **Data File Properties**.

The **Outlook Today - \[Personal Folders\]: Properties** window opens:

Click the **Folder Size** button here.

The **Folder Size** window opens. In this window, you can see the total size of all your folders and simultaneously check how large your subfolders are.