Attachment size exceeds the allowable limit error when you add a large attachment to an email

When you add an attachment to an email message in Microsoft Office Outlook 2010, you receive the following error message:

The attachment size exceeds the allowable limit.
The steps to modify the default attachment limit depend on the type of email account that you are using with Outlook 2010.

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:

322756 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 2010 for an Internet email account yourself, follow these steps:
  1. Exit Outlook.
  2. Start Registry Editor.
  3. Locate and then select one of the following registry subkeys:

    Note Manually create the path in the registry if it does not currently exist.

  4. Add the following registry data under this subkey:

    Value type: DWORD
    Value name: MaximumAttachmentSize

    Value data: An integer that specifies the total maximum allowable attachment size. For example, specify 30720 (Decimal) to configure a 30-MB limit.
    • Specify a value of zero (0) if you want to configure no limit for attachments.
    • Specify a value that is less than 20 MB if you want to configure a limit that is less than the default 20 MB.
  5. Exit Registry Editor
  6. Start Outlook.

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