How to view the size and properties of email messages in Outlook?
Commonly you can reduce your mailbox size by removing large email messages, and the easiest way to find out large email messages is to sort by message size. But how to display and view messages’ sizes in Outlook? What about email messages’ properties? There are a couple of tricks to help you solve it with ease.
View the sizes of all email messages in one folder
View the size and properties of one email message
View the sizes of all email messages in one folder
In the first section we will guide you to view the sizes of all email messages in one folder easily.
Step 1: Shift to the Mail view by clicking the "Mail" in the Navigation Pane.
Step 2: Select and highlight the email folder in which you will view the size of messages.
Step 3: Turn off the Reading Pane by clicking the "Reading Pane" > "Off" in the "Layout" group on the "View" tab in Outlook 2010 / 2013.

If you are using Outlook 2007, please click "View" > "Reading Pane" > "Off".
Then you can view the size of all email messages in the "Size" column. See the following screenshot:

Note: To sort these messages by size, please click the "Size" column which is located at the top of the email list.
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View the size and properties of one email message
This section will walk you through viewing the size and properties of the selected email message in Microsoft Outlook quickly.
Step 1: Shift to the Mail view by clicking the "Mail" in the Navigation Pane.
Step 2: Open the email message that you will view its size and properties by double-clicking it.
Step 3: View the size and properties of the opened message:
If you are using Outlook 2007, please click the Office button > "Properties". The message’s size and properties display in the coming Properties dialog box.
If you are using Outlook 2010 or 2013, please click "File" > "Info".

Then you will get the size of this opened email message beside the "Properties" button immediately. See the screenshot above.
If you need to view this email message’s properties, please continue to click the "Properties" button, and you will see the message’s properties at once in the Properties dialog box. See the following screenshot:

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