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Viewing IMAP Folder Storage

Last updated on by Freeola Support

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Regularly monitoring your IMAP email accounts through your email client can provide several benefits for your email service.

Keeping your IMAP storage low could help improve loading times of your email client, prevent large data usage when adding your address to a new mail software or device, or help to reduce costs of your email subscription.

This guide will explain how to view and monitor individual IMAP folder usage for the most popular email clients.

Mozilla Thunderbird

Modern versions of Thunderbird

Tested in Version 115/Supernova

With Thunderbird open, select the three horizontal dots above the address pane.

Thunderbird Folder Pane Options

From the menu that appears click Show Folder Size.

Thunderbird Show Folder Size

A new column will now appear next to each folder (and sub-folder) within the side panel. This column will show the size of each folder in kB, MB or GB.

Thunderbird Folder Size

Older versions of Thunderbird

Tested in Version 91.10.0

In Thunderbird, from the Top Menu select View, Layout then Folder Pane Columns.

Thunderbird Folder Pane Columns

If you don’t have the Top Menu Enabled

You can instead use the Menu Stack/Burger icon (three horizontal lines) in the top right-hand corner to see the View, Layout, Folder Pane options.

The new column that appears will provide options to show the total number of messages, the number of unread messages, and the size of the folder.

For the purposes of this guide we are only interested in the Size of the Folder.

To enable this view, click on the tiny icon at the top of the folder pane - it looks like a little table with a downward pointing triangle - and click the Size menu option.

Mozilla Thunderbird IMAP Folder Size

This will update the column to display the Folder Size, as above. Fields with arrows indicate sub-folders within the parent folder. Sizes will be displayed in kB, MB and GB.

You can now use this information to manage storage for your individual IMAP folders.

Microsoft Outlook
'New' Outlook (Replacement for Mail in Windows 10 & 11)

It is not currently possible to view IMAP folder sizes within this software.

Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016 & Outlook 2013

With your Outlook program open, navigate to the main Mail view, then click your account to highlight it. Next, select Folder then Folder Properties from the top menu. 

Outlook Folder Properties

On the Properties window that opens, click Folder Size towards the bottom. This will open a new window, headed Folder Size.

Outlook Folder Properties

This window will show the size for each subfolder connected with your account. Each folder size is indicated in kilobytes (KB).

There are many online tools available for converting large KB numbers into something more readable, but a quick method is to move the decimal point over three places to the left.

For example, 4742 KB is roughly 4.7 MB.

Apple Mail

Firstly open the Mail app on your Apple Device. Once opened, in the Mail sidebar, Ctrl+click (or right-click) the Inbox, then choose Get Account Info.

Mac Mail IMAP Storage

In the Account Info window that opens, click the Account drop-down menu, then choose an account.

If you only have one account within Mail, this list will be short.

Click Quota Limits to view details about your account. The window should display details on the size and number of messages within your various IMAP folders. Sizes will be displayed in kB, MB and GB.

Mac Mail IMAP Storage

Clicking a folder then Show Messages opens that folder in new window, allowing you to remove/archive any messages you no longer require.

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