Article ID: 2840099 - View products that this article applies to.
Consider the following scenario:
System.ArgumentOutOfRangeException: index is out of range.
To resolve this issue, install the following update rollup:
(http://support.microsoft.com/kb/2803727/ )Description of Update Rollup 1 for Exchange Server 2010 Service Pack 3
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the EmailMessage.Save method, go to the Microsoft MSDN website EmailMessage.Save Method