diff --git a/modules/applications/thunderbird/home/common.nix b/modules/applications/thunderbird/home/common.nix
new file mode 100644
index 0000000..92cf9d5
--- /dev/null
+++ b/modules/applications/thunderbird/home/common.nix
@@ -0,0 +1,24 @@
+{ pkgs, ... }:
+{
+  programs.thunderbird = {
+    enable = true;
+    package = pkgs.thunderbird;
+
+    languagePacks = [ "ja" ];
+
+    policies = {
+      DisableTelemetry = true;
+      DisableAppUpdate = true;
+      InAppNotification_Disabled = true;
+    };
+
+    settings = {
+      "mailnews.start_page.enabled" = false;
+      "mail.shell.checkDefaultClient" = false;
+    };
+
+    profiles.default = {
+      isDefault = true;
+    };
+  };
+}
diff --git a/modules/applications/thunderbird/home/nixos.nix b/modules/applications/thunderbird/home/nixos.nix
new file mode 100644
index 0000000..c42571f
--- /dev/null
+++ b/modules/applications/thunderbird/home/nixos.nix
@@ -0,0 +1,10 @@
+_: {
+  xdg.mimeApps = {
+    enable = true;
+
+    defaultApplications = {
+      "x-scheme-handler/mailto" = "thunderbird.desktop";
+      "message/rfc822" = "thunderbird.desktop";
+    };
+  };
+}
diff --git a/modules/profiles/workload/personal/meta.nix b/modules/profiles/workload/personal/meta.nix
index 93636f7..4952191 100644
--- a/modules/profiles/workload/personal/meta.nix
+++ b/modules/profiles/workload/personal/meta.nix
@@ -13,5 +13,6 @@
     "applications.zoom"
     "applications.obs"
     "applications.nani"
+    "applications.thunderbird"
   ];
 }