diff --git a/pkgs/applications/networking/mailreaders/thunderbird/5.x.nix b/pkgs/applications/networking/mailreaders/thunderbird/7.x.nix
similarity index 92%
rename from pkgs/applications/networking/mailreaders/thunderbird/5.x.nix
rename to pkgs/applications/networking/mailreaders/thunderbird/7.x.nix
index a409cae0d28e..1f51a8e63b50 100644
--- a/pkgs/applications/networking/mailreaders/thunderbird/5.x.nix
+++ b/pkgs/applications/networking/mailreaders/thunderbird/7.x.nix
@@ -11,18 +11,18 @@
 
 }:
 
-let version = "5.0"; in
+let version = "7.0.1"; in
 
-# from wikipedia: This Release no longer supports versions of Mac OS X
-# before Mac OS X 10.5 Leopard or Mac computers with PowerPC processors.
 stdenv.mkDerivation {
   name = "thunderbird-${version}";
 
   src = fetchurl {
     url = "http://releases.mozilla.org/pub/mozilla.org/thunderbird/releases/${version}/source/thunderbird-${version}.source.tar.bz2";
-    sha1 = "392c3e0ef70b62c29a543f88b2b8d5a51bfe69a7";
+    sha1 = "ccfc6fe3fe4ad07b214e20bc440d20e14d3ffbe5";
   };
 
+  enableParallelBuilding = true;
+
   buildInputs =
     [ pkgconfig perl python zip bzip2 gtk dbus_glib alsaLib libIDL nspr libnotify
       libnotify cairo pixman fontconfig yasm mesa nss
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 035cd00bc9ea..ab78b6959a29 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7323,7 +7323,7 @@ let
 
   thinkingRock = callPackage ../applications/misc/thinking-rock { };
 
-  thunderbird = thunderbird3;
+  thunderbird = thunderbird7;
 
   thunderbird2 = callPackage ../applications/networking/mailreaders/thunderbird/2.x.nix {
     inherit (gnome) libIDL;
@@ -7333,7 +7333,7 @@ let
     inherit (gnome) libIDL;
   };
 
-  thunderbird5 = callPackage ../applications/networking/mailreaders/thunderbird/5.x.nix {
+  thunderbird7 = callPackage ../applications/networking/mailreaders/thunderbird/7.x.nix {
     inherit (gnome) libIDL;
   };