Outlook 2010 gets the maximum message size from Exchange server and prevents you from sending the message instead of sending it then bouncing it back. For those without Exchange, the limit is 20 MB. If you need to send larger messages or Outlook is incorrectly telling you the message is too large, you can edit the registry.
Open the registry editor and browse to HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences
Create a DWORD called MaximumAttachmentSize
Set it to the maximum your ISP allows (in KB) or 0 for unlimited message size.
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