ArgumentOutOfRangeException exception when an EWS application creates a new MIME email in an Exchange Server 2010 environment

Symptoms

Consider the following scenario:

You run an Exchange Web Services (EWS) application to create a MIME email message that contains a file attachment.
In the code of the application, you specify the version of EWS for the ExchangeService object. For example:
```
ExchangeService esb = new ExchangeService(ExchangeVersion.Exchange2010_SP2);
```

In this scenario, the application fails when the EmailMessage.Save method is called. The following exception is thrown:

System.ArgumentOutOfRangeException: index is out of range.

To resolve this issue, install the following update rollup:

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.

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