diff --git a/mozilla/mail/base/content/mailWindowOverlay.xul b/mozilla/mail/base/content/mailWindowOverlay.xul
index 58e630f1267..bf7b2425ecc 100644
--- a/mozilla/mail/base/content/mailWindowOverlay.xul
+++ b/mozilla/mail/base/content/mailWindowOverlay.xul
@@ -348,7 +348,9 @@
   <key id="key_nextMsg" key="&nextMsgCmd.key;"                       oncommand="goDoCommand('cmd_nextMsg')"/>
   <key id="key_nextUnreadMsg" key="&nextUnreadMsgCmd.key;"           oncommand="goDoCommand('cmd_nextUnreadMsg')"/>
   <key id="key_expandAllThreads" key="&expandAllThreadsCmd.key;"     oncommand="goDoCommand('cmd_expandAllThreads')"/>
+  <key key="&expandAllThreadsCmd.key;" modifiers="shift"             oncommand="goDoCommand('cmd_expandAllThreads')"/>
   <key id="key_collapseAllThreads" key="&collapseAllThreadsCmd.key;" oncommand="goDoCommand('cmd_collapseAllThreads')"/>
+  <key key="&collapseAllThreadsCmd.key;" modifiers="shift"           oncommand="goDoCommand('cmd_collapseAllThreads')"/>
   <key id="key_nextUnreadThread" key="&nextUnreadThreadCmd.key;"     oncommand="goDoCommand('cmd_nextUnreadThread')"/>
   <key id="key_previousMsg" key="&previousMsgCmd.key;"               oncommand="goDoCommand('cmd_previousMsg')"/>
   <key id="key_previousUnreadMsg" key="&previousUnreadMsgCmd.key;"   oncommand="goDoCommand('cmd_previousUnreadMsg')"/>
@@ -382,8 +384,11 @@
 
   <keyset id="viewZoomKeys">
     <key id="key_textZoomReduce" key="&textZoomReduceCmd.commandkey;" command="cmd_textZoomReduce"  modifiers="accel"/>
+    <key key="&textZoomReduceCmd.commandkey;" command="cmd_textZoomReduce"  modifiers="accel shift"/>
     <key id="key_textZoomEnlarge" key="&textZoomEnlargeCmd.commandkey;" command="cmd_textZoomEnlarge" modifiers="accel"/>
+    <key key="&textZoomEnlargeCmd.commandkey;" command="cmd_textZoomEnlarge" modifiers="accel shift"/>
     <key key="&textZoomEnlargeCmd.commandkey2;" command="cmd_textZoomEnlarge" modifiers="accel"/>
+    <key key="&textZoomEnlargeCmd.commandkey2;" command="cmd_textZoomEnlarge" modifiers="accel shift"/>
     <key id="key_textZoomReset"   key="&textZoomResetCmd.commandkey;"    command="cmd_textZoomReset"   modifiers="accel"/>
   </keyset>