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When you add an attachment to an email message in Microsoft Office Outlook 2013, you receive the following error message:
The file you're attaching is bigger than the server allows. Try putting the file in a shared location and sending a link instead.
This problem occurs for one of the following reasons, depending on the kind of email account that you are using.
Internet email account (POP3, IMAP, HTTP)
You receive this error message because Outlook 2013 has a default attachment size limit of 20 megabytes (20480 KB) for Internet email accounts. This limit prevents your computer from continually trying to upload very large attachments that exceed the limits of most Internet service providers. This limit applies whether you are adding one large attachment that is greater than 20 megabytes (MB) or several attachments whose sum total size is greater than 20 MB.
Microsoft Exchange Server email account
If you are using an Exchange Server mailbox, you receive this error message (by default) if you attach one or more items to a message, and if the sum total of the attachments is greater than 10 MB (10240 KB). This attachment limit is not related to the limit in Outlook 2013 for Internet email accounts. This limit for an Exchange mailbox stems from the Maximum send size setting that is configured in the Transport Settings Properties dialog box by the Exchange administrator (Refer the following screen shot).
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The steps to modify the default attachment limit depend on the type of email account that you are using with Outlook 2013.
Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://vkbexternal/VKBWebService/ViewContent.aspx?scid=kb;EN-US;322756&PortalId=1)How to back up and restore the registry in Windows XP and Windows Vista
Internet email account (POP3, IMAP, HTTP)To modify the default attachment limit size in Outlook 2013 for an Internet email account yourself, follow these steps:
Microsoft Exchange Server email accountIf you are using an Exchange Server account, the 20-MB attachment limit for Internet email accounts is not used by Outlook 2013. Instead, Outlook uses the limit that is configured on your Exchange server. To modify the setting that is used to control the size of a message that is sent through an Exchange Server account, follow these steps.