How to find out attachments by message size in Outlook?

Attachments in messages will increase your mailbox size, and make your mailbox big. It is necessary to slim your mailbox in time, and keep your mailbox in a reasonable size. And the easiest way of making your mailbox smaller is to search and move/delete big attachments. Here we will show you two tricky ways to find out attachments by size quickly in Microsoft Outlook.

Find out attachments by size with search folder of With Attachment

Find out attachments by size with custom search folder

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Find out attachments by size with search folder of With Attachment

This method will help you create a search folder and group all messages with attachments into the search folder of With Attachment. In this search folder, you can easily find out attachments by size when messages are arranged by size.

Step 1: Open the New Search Folder dialog box:

In Outlook 2010 and 2013, please click the New Search Folder on the Folder tab.
In Outlook 2007, please click the File > New > Search Folder.

Step 2: In the New Search Folder dialog box,

Select and highlight the Mail with attachments in the Select a search Folder: box;
Select an email account in the Search mail in: box.
Click the OK button.

Step 3: In the navigation Pane, please select and open the new created folder of With Attachment.

Step 4: Please close the Reading Pane:

In Outlook 2010 and 2013, please click the Reading Pane > Off in the Layout group on the View tab.
In Outlook 2007, please click the View > Reading Pane > Off.

Step 5: Sort these messages by size:

In Outlook 2010 and 2013, please click the Size in the Arrangement box on the View tab.
In Outlook 2007, please click the View > Arrange By > Size.

Till now all messages with attachment have been grouped into the With Attachment folder, and sorted by size. Now you can easily find out attachments by messages size in this view.

Find out attachments by size with custom search folder

Apart from grouping messages with attachments into With Attachment folder and changing the folder view, you can also create a custom search folder, and group messages that are with attachments in specified sizes.

Step 1: Open the New Search Folder dialog box:

In Outlook 2010 and 2013, please click the New Search Folder on the Folder tab.
In Outlook 2007, please click the File > New > Search Folder.

Step 2: In the New Search Folder dialog box,

Select and highlight the Create a custom Search Folder in the Select a Search Folder: box;
Click the Choose button in the Customize Search Folder: section.

Step 3: In the Custom Search Folder dialog box:

Enter a name for the new customizing folder in the Name: box;
Click the Criteria button.

Step 4: Now you get into the Search Folder Criteria dialog box, please go to the More Choices tab, and:

Check the Only items with: option, and keep the One or more attachments in the following box;
Click the Size (kilobytes) box and select one item in the drop down list, and enter size number in the following boxes based on your needs.

For example, you need to find out messages with attachment and with size between 200 KB and 400 KB. Firstly please click the Size (kilobytes) box and select the between in the drop down list, and then enter 200 and 400 in the following boxes.

Step 5: Click all OK buttons in each dialog box.

Then you will find out all messages with attachments and whose size is in specified range are grouped into the customized search folder.

In our case, all messages with attachments, whose size are between 200 KB and 400 KB, are grouped into the custom search folder of Find attachments by size at once.