Outlook issues with diacritics, Reply-To and UTF-8

[sigge]

When sending HTML mails with a Reply-To address set in Outlook 2003/2007 the following will occur.
This is an example of an test mail sent through scalix with Outlook 2003/2007 it should say "Test åäö åäö" but is displayed like this.

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Test ��� ���

This is what it looks like on the receiving end if the receipient is using a Outlook 2003/2007 client but will be displayed correctly if viewed in OWA. Here is a snippet from the header..

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From: =?iso-8859-1?Q?P=E4r_Test?= <par.test@domain.se>
Reply-To: =?UTF-8?Q?P=C3=A4r_Test?= <par.test@domain.se>


Now if I remove the Reply-To address the mail will be displayed correctly. If I send the same mail from a Thunderbird client (with a Reply-To address) it will be displayed correctly. The difference here is from what I can see is how Thunderbird does its HTML encoding.. snippet from Thunderbird HTML source..

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<font color="#cc0000">test</font> &aring;&auml;&ouml; &aring;&auml;&ouml;<br>

Snippet from Outlook HTML source..

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<span style='font-size:10.0pt;font-family:Arial'>Test åäö åäö<o:p></o:p></span></font>

Thunderbird does its encoding the right way whereas Outlook dosent use the html code for the Swedish characters. But why is the Reply-To header screwing everything up?

Any comments?