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How to view mailbox or folders' sizes in Outlook?

Author: Kelly Last Modified: 2014-03-11

Has your Microsoft Outlook become heavy and worked slowly? There may congest a number of email messages, tasks, and appointments in Microsoft Outlook for a long time. Before cleaning up your mailbox, you'd better to check how much space folders take up currently. Here we will show you how to check and view each mailbox or folder’s sizes in Microsoft outlook quickly.

View mailbox or folders' sizes with the Properties feature

View mailbox or folders' sizes with the Mailbox Cleanup feature

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arrow blue right bubbleView mailbox or folders' sizes with the Properties feature

You can check the space that the mailbox and its folders occupy currently in the folder properties. Please do it with following steps:

Step 1: Right click the root folder of a mailbox, and click the Data File Properties in the right-clicking menu.

If you are using the Outlook 2007, you will get the Properties of for "Personal Folders" instead of Data File Properties from the right-clicking menu.

Step 2: In the Folder Properties dialog box, please click the Folder Size button.

Then in the Folder Size dialog box, you can easily check the mailbox size and the sizes of each subfolder. See the following screen shot:

Note: For the only one folder without subfolders, you can’t view the size of it by this method.

arrow blue right bubbleView mailbox or folders' sizes with the Mailbox Cleanup feature

When you are cleaning up your mailbox, the View Mailbox Size feature enables you to view the total size of current mailbox and the sizes of each folder in this mailbox.

Step 1: Open the Mailbox Cleanup dialog box:

  • In Outlook 2010 / 2013, please click the File > Into > Cleanup Tools > Mailbox Cleanup. See the following screen shot.
  • In Outlook 2007, please click the Tools > Mailbox Cleanup.

Step 2: In the Mailbox Cleanup dialog box, please click the View Mailbox Size button.

Then in the coming Folder Size dialog box, you can view the total size of this mailbox, as well as the sizes of each subfolder in this mailbox, including the Inbox folder, Sent Items folder, Outbox folder, Delete Item folder, etc. See the following screen shot:

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Your example has a few folders .. . . I have 100's. The Folder size list is not sortable. Any idea how to do this so that I can find the largest folders?
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