recieving forwarded emails send from microsoft exchange server can not be printed. The original mail text where show as an attachment. This attachement gets open in a separate window and shows the "print"-button.
By pressing the button nothing happens.

From the original mail context the header has these attributes:
Content-Type: message/rfc822
Content-Disposition: attachment

X-MimeOLE: Produced By Microsoft Exchange V6.5
Received: from mx.lcc.de ([]) by exchange.lcrgmbh.de with Microsoft SMTPSVC(6.0.3790.4675); Fri, 6 Jan 2012 10:42:54 +0100
MIME-Version: 1.0
Content-Type: multipart/related;

Within this mail you will find the following
Content-Type: text/html;
Content-Transfer-Encoding: quoted-printable

<html xmlns:v=3D"urn:schemas-microsoft-com:vml" =
xmlns=3D"urn:schemas-microsoft-comfficeffice" =
xmlns:w=3D"urn:schemas-microsoft-comffice:word" =
xmlns:x=3D"urn:schemas-microsoft-comffice:excel" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" =
xmlns=3D"http://www.w3.org/TR/REC-html40"><head><meta name=3DGenerator =
content=3D"Microsoft Word 12 (filtered medium)"><!--[if =
!mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}

And last not lease the "error console" shows a lot of javascript errors, e.g.:
Warnung: reference to undefined property this._details[e]
Zeile: 21672
Fehler: this._xulWindow is null
Quelldatei: chrome://webrunner/content/webrunner.js
Zeile: 822
Fehler: this.docShell is null
Quelldatei: chrome://global/content/bindings/browser.xml
Zeile: 0

Trying to print from the inbox direcly, every thing works fine.

Please check this, if this could be a bug.