--- a/mail/themes/pinstripe/mail/messageHeader.css
+++ b/mail/themes/pinstripe/mail/messageHeader.css
@@ -51,17 +51,17 @@
   padding: .5em;
   min-width: 1px;
   color: black;
   font-size: 120%;
 }
 
 #expandedHeaderView {
   color: #2e3436;
-  font-size: 12px;
+  font-size: 100%;
   overflow: visible;
 }
 
 #variousHeadersBox{
   padding-bottom: 1em;
 }
 
 #collapsedHeaderDisplayName {
@@ -240,18 +240,17 @@ description[selectable="true"]:focus > d
   min-height: 7px;
   border-top: 1px solid #C8C8C8;
   background-color: #E6E6E6;
 }
 
 /* ::::: msg header captions ::::: */
 
 #msgHeaderView {
-  font-family: Arial;
-  font-size: 12px;
+  font-size: 100%;
 }
 
 #msgHeaderViewDeck {
   margin: 0;
   padding: 0;
 }
 
 

--- a/mail/themes/qute/mail/jar.mn
+++ b/mail/themes/qute/mail/jar.mn
@@ -3,17 +3,17 @@ classic.jar:
 +   skin/classic/global/tree/sort-asc.gif (icons/sort-asc.gif)
 +   skin/classic/global/tree/sort-dsc.gif (icons/sort-dsc.gif)
     skin/classic/communicator/smileys.css
 % skin messenger classic/1.0 %skin/classic/messenger/
     skin/classic/messenger/primaryToolbar.css
     skin/classic/messenger/accountCentral.css
     skin/classic/messenger/accountManage.css
     skin/classic/messenger/accountWizard.css
-*   skin/classic/messenger/messageHeader.css
+    skin/classic/messenger/messageHeader.css
     skin/classic/messenger/messageBody.css
     skin/classic/messenger/messageQuotes.css
     skin/classic/messenger/messenger.css
     skin/classic/messenger/mailWindow1.css
     skin/classic/messenger/tagColors.css
     skin/classic/messenger/messageWindow.css
     skin/classic/messenger/searchBox.css
     skin/classic/messenger/junkMail.css

--- a/mail/themes/qute/mail/messageHeader.css
+++ b/mail/themes/qute/mail/messageHeader.css
@@ -48,26 +48,21 @@
 
 /* ::::: msg header toolbars ::::: */
 
 #collapsedHeaderView {
   padding: .5em;
   min-width: 1px;
   color: black;
   font-size: 125%;
-  font-family: Arial; /* default font looks bad & not antialiased on windows */
 }
 
 #expandedHeaderView {
   color: #2e3436;
-%ifdef XP_WIN
-  font-size: 95%;
-%else
   font-size: 100%;
-%endif
   overflow: visible;
 }
 
 #variousHeadersBox{
   padding-bottom: 1em;
 }
 
 #collapsedHeaderDisplayName {
@@ -242,17 +237,17 @@ description[selectable="true"]:focus > d
 
 #attachmentView[attachmentOverflow="true"] {
   overflow: auto;
 }
 
 /* ::::: msg header captions ::::: */
 
 #msgHeaderView {
-  font-size: 12px;
+  font-size: 100%;
 }
 
 #msgHeaderViewDeck {
   margin: 0;
   padding: 0;
 }
 
 .msgHeaderView-button {