diff --git a/components/contacts/contact-activity.tsx b/components/contacts/contact-activity.tsx
new file mode 100644
index 00000000..2a4b9a75
--- /dev/null
+++ b/components/contacts/contact-activity.tsx
@@ -0,0 +1,280 @@
+"use client";
+
+import { useEffect, useState } from "react";
+import { useTranslations, useFormatter } from "next-intl";
+import { Mail, CalendarDays, Loader2 } from "lucide-react";
+import { useRouter } from "@/i18n/navigation";
+import { useAuthStore } from "@/stores/auth-store";
+import { useEmailStore } from "@/stores/email-store";
+import { useCalendarStore } from "@/stores/calendar-store";
+import { cn } from "@/lib/utils";
+import type { ContactCard, Email, CalendarEvent } from "@/lib/jmap/types";
+
+const EMAIL_LIMIT = 5;
+const EVENT_LIMIT = 5;
+const EVENT_LOOKAHEAD_DAYS = 365;
+
+interface ContactActivityProps {
+  contact: ContactCard;
+}
+
+function getContactEmails(contact: ContactCard): string[] {
+  if (!contact.emails) return [];
+  const seen = new Set<string>();
+  const result: string[] = [];
+  for (const e of Object.values(contact.emails)) {
+    const addr = e.address?.trim().toLowerCase();
+    if (addr && !seen.has(addr)) {
+      seen.add(addr);
+      result.push(addr);
+    }
+  }
+  return result;
+}
+
+function buildEmailFilter(addresses: string[]): Record<string, unknown> {
+  const conditions: Record<string, unknown>[] = [];
+  for (const addr of addresses) {
+    conditions.push({ from: addr });
+    conditions.push({ to: addr });
+  }
+  if (conditions.length === 1) return conditions[0];
+  return { operator: "OR", conditions };
+}
+
+function eventInvolvesContact(event: CalendarEvent, addresses: Set<string>): boolean {
+  if (!event.participants) return false;
+  for (const p of Object.values(event.participants)) {
+    const email = p.email?.trim().toLowerCase();
+    if (email && addresses.has(email)) return true;
+    if (p.sendTo) {
+      for (const target of Object.values(p.sendTo)) {
+        const m = typeof target === "string" ? target.match(/mailto:(.+)/i) : null;
+        if (m && addresses.has(m[1].trim().toLowerCase())) return true;
+      }
+    }
+  }
+  if (event.organizerCalendarAddress) {
+    const m = event.organizerCalendarAddress.match(/mailto:(.+)/i);
+    const org = m ? m[1].trim().toLowerCase() : event.organizerCalendarAddress.trim().toLowerCase();
+    if (addresses.has(org)) return true;
+  }
+  return false;
+}
+
+export function ContactActivity({ contact }: ContactActivityProps) {
+  const t = useTranslations("contacts.activity");
+  const format = useFormatter();
+  const router = useRouter();
+  const client = useAuthStore((s) => s.client);
+  const selectEmail = useEmailStore((s) => s.selectEmail);
+  const setSelectedEventId = useCalendarStore((s) => s.setSelectedEventId);
+  const setSelectedDate = useCalendarStore((s) => s.setSelectedDate);
+
+  const [emails, setEmails] = useState<Email[] | null>(null);
+  const [events, setEvents] = useState<CalendarEvent[] | null>(null);
+  const [emailsLoading, setEmailsLoading] = useState(false);
+  const [eventsLoading, setEventsLoading] = useState(false);
+  const [emailsError, setEmailsError] = useState(false);
+  const [eventsError, setEventsError] = useState(false);
+
+  const addresses = getContactEmails(contact);
+  const addressKey = addresses.join(",");
+
+  useEffect(() => {
+    if (!client || addresses.length === 0) {
+      setEmails([]);
+      return;
+    }
+    let cancelled = false;
+    setEmailsLoading(true);
+    setEmailsError(false);
+    client
+      .advancedSearchEmails(buildEmailFilter(addresses), undefined, EMAIL_LIMIT, 0)
+      .then((res) => {
+        if (cancelled) return;
+        setEmails(res.emails);
+      })
+      .catch(() => {
+        if (cancelled) return;
+        setEmailsError(true);
+        setEmails([]);
+      })
+      .finally(() => {
+        if (!cancelled) setEmailsLoading(false);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, [client, addressKey]); // eslint-disable-line react-hooks/exhaustive-deps
+
+  useEffect(() => {
+    if (!client || addresses.length === 0) {
+      setEvents([]);
+      return;
+    }
+    let cancelled = false;
+    setEventsLoading(true);
+    setEventsError(false);
+    const now = new Date();
+    const before = new Date(now.getTime() + EVENT_LOOKAHEAD_DAYS * 24 * 60 * 60 * 1000);
+    const addrSet = new Set(addresses);
+    client
+      .queryAllCalendarEvents(
+        { after: now.toISOString(), before: before.toISOString() },
+        [{ property: "start", isAscending: true }],
+        500,
+      )
+      .then((all) => {
+        if (cancelled) return;
+        const matching = all
+          .filter((e) => eventInvolvesContact(e, addrSet))
+          .sort((a, b) => a.start.localeCompare(b.start))
+          .slice(0, EVENT_LIMIT);
+        setEvents(matching);
+      })
+      .catch(() => {
+        if (cancelled) return;
+        setEventsError(true);
+        setEvents([]);
+      })
+      .finally(() => {
+        if (!cancelled) setEventsLoading(false);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, [client, addressKey]); // eslint-disable-line react-hooks/exhaustive-deps
+
+  if (addresses.length === 0) return null;
+
+  const handleOpenEmail = (email: Email) => {
+    selectEmail(email);
+    router.push("/mail");
+  };
+
+  const handleOpenEvent = (event: CalendarEvent) => {
+    const start = new Date(event.start);
+    if (!isNaN(start.getTime())) setSelectedDate(start);
+    setSelectedEventId(event.id);
+    router.push("/calendar");
+  };
+
+  const formatEmailDate = (dateStr: string) => {
+    const d = new Date(dateStr);
+    if (isNaN(d.getTime())) return dateStr;
+    const now = new Date();
+    const sameYear = d.getFullYear() === now.getFullYear();
+    return format.dateTime(d, sameYear
+      ? { month: "short", day: "numeric" }
+      : { year: "numeric", month: "short", day: "numeric" });
+  };
+
+  const formatEventDate = (event: CalendarEvent) => {
+    const d = new Date(event.start);
+    if (isNaN(d.getTime())) return event.start;
+    if (event.showWithoutTime) {
+      return format.dateTime(d, { weekday: "short", month: "short", day: "numeric" });
+    }
+    return format.dateTime(d, {
+      weekday: "short",
+      month: "short",
+      day: "numeric",
+      hour: "numeric",
+      minute: "2-digit",
+    });
+  };
+
+  return (
+    <>
+      <ActivitySection icon={Mail} title={t("recent_emails")}>
+        {emailsLoading ? (
+          <LoadingRow />
+        ) : emailsError ? (
+          <p className="text-xs text-muted-foreground">{t("load_failed")}</p>
+        ) : !emails || emails.length === 0 ? (
+          <p className="text-xs text-muted-foreground">{t("no_emails")}</p>
+        ) : (
+          emails.map((email) => (
+            <button
+              key={email.id}
+              type="button"
+              onClick={() => handleOpenEmail(email)}
+              className="w-full text-left p-2 -mx-2 rounded-md hover:bg-muted/60 transition-colors touch-manipulation"
+            >
+              <div className="flex items-baseline justify-between gap-2">
+                <span className="text-sm font-medium truncate">
+                  {email.subject || t("no_subject")}
+                </span>
+                <span className="text-xs text-muted-foreground flex-shrink-0">
+                  {formatEmailDate(email.receivedAt)}
+                </span>
+              </div>
+              {email.preview && (
+                <p className="text-xs text-muted-foreground truncate mt-0.5">
+                  {email.preview}
+                </p>
+              )}
+            </button>
+          ))
+        )}
+      </ActivitySection>
+
+      <ActivitySection icon={CalendarDays} title={t("upcoming_events")}>
+        {eventsLoading ? (
+          <LoadingRow />
+        ) : eventsError ? (
+          <p className="text-xs text-muted-foreground">{t("load_failed")}</p>
+        ) : !events || events.length === 0 ? (
+          <p className="text-xs text-muted-foreground">{t("no_events")}</p>
+        ) : (
+          events.map((event) => (
+            <button
+              key={event.id}
+              type="button"
+              onClick={() => handleOpenEvent(event)}
+              className="w-full text-left p-2 -mx-2 rounded-md hover:bg-muted/60 transition-colors touch-manipulation"
+            >
+              <div className="flex items-baseline justify-between gap-2">
+                <span className="text-sm font-medium truncate">
+                  {event.title || t("no_title")}
+                </span>
+                <span className="text-xs text-muted-foreground flex-shrink-0">
+                  {formatEventDate(event)}
+                </span>
+              </div>
+            </button>
+          ))
+        )}
+      </ActivitySection>
+    </>
+  );
+}
+
+function ActivitySection({
+  icon: Icon,
+  title,
+  children,
+}: {
+  icon: React.ComponentType<{ className?: string }>;
+  title: string;
+  children: React.ReactNode;
+}) {
+  return (
+    <div className={cn("rounded-lg border border-border bg-card p-4 border-l-[3px]", "border-l-rose-400 dark:border-l-rose-500")}>
+      <div className="flex items-center gap-2 mb-2.5">
+        <Icon className="w-4 h-4 text-muted-foreground" />
+        <h3 className="text-sm font-medium text-muted-foreground">{title}</h3>
+      </div>
+      <div className="space-y-1 pl-6">{children}</div>
+    </div>
+  );
+}
+
+function LoadingRow() {
+  return (
+    <div className="flex items-center gap-2 text-xs text-muted-foreground">
+      <Loader2 className="w-3.5 h-3.5 animate-spin" />
+    </div>
+  );
+}
diff --git a/components/contacts/contact-detail.tsx b/components/contacts/contact-detail.tsx
index ffdd8e28..f58f9902 100644
--- a/components/contacts/contact-detail.tsx
+++ b/components/contacts/contact-detail.tsx
@@ -8,6 +8,7 @@ import { Button } from "@/components/ui/button";
 import { cn } from "@/lib/utils";
 import type { ContactCard, AnniversaryDate, PartialDate } from "@/lib/jmap/types";
 import { getContactDisplayName, getContactPrimaryEmail } from "@/stores/contact-store";
+import { ContactActivity } from "./contact-activity";
 import { useSmimeStore } from "@/stores/smime-store";
 import { parseCertificatePemOrDer, extractCertificateInfo } from "@/lib/smime/certificate-utils";
 import type { CertificateInfo } from "@/lib/smime/types";
@@ -204,6 +205,8 @@ export function ContactDetail({ contact, onEdit, onDelete, isMobile, className }
 
       <div className="px-6 py-6">
         <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-3 gap-4">
+          <ContactActivity contact={contact} />
+
           {/* Contact info */}
           {emails.length > 0 && (
             <Section icon={Mail} title={t("detail.emails")} category="contact">
diff --git a/locales/de/common.json b/locales/de/common.json
index 21a595fe..7640c099 100644
--- a/locales/de/common.json
+++ b/locales/de/common.json
@@ -1816,6 +1816,15 @@
       "cert_imported": "Zertifikat importiert",
       "cert_import_failed": "Import des Zertifikats fehlgeschlagen"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "Neuer Kontakt",
       "edit_title": "Kontakt bearbeiten",
diff --git a/locales/en/common.json b/locales/en/common.json
index 157e0506..88951ce0 100644
--- a/locales/en/common.json
+++ b/locales/en/common.json
@@ -1816,6 +1816,15 @@
       "scheduling_uri": "Scheduling URL",
       "freebusy_uri": "Free/Busy URL"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "New Contact",
       "edit_title": "Edit Contact",
diff --git a/locales/es/common.json b/locales/es/common.json
index 37f993b5..85712d86 100644
--- a/locales/es/common.json
+++ b/locales/es/common.json
@@ -1816,6 +1816,15 @@
       "cert_imported": "Certificado importado",
       "cert_import_failed": "Error al importar el certificado"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "Nuevo contacto",
       "edit_title": "Editar contacto",
diff --git a/locales/fr/common.json b/locales/fr/common.json
index 7ba16d47..7afefb65 100644
--- a/locales/fr/common.json
+++ b/locales/fr/common.json
@@ -1816,6 +1816,15 @@
       "cert_imported": "Certificat importé",
       "cert_import_failed": "Échec de l'import du certificat"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "Nouveau contact",
       "edit_title": "Modifier le contact",
diff --git a/locales/it/common.json b/locales/it/common.json
index 1a6f7276..d2eee9b1 100644
--- a/locales/it/common.json
+++ b/locales/it/common.json
@@ -1816,6 +1816,15 @@
       "cert_imported": "Certificato importato",
       "cert_import_failed": "Importazione del certificato non riuscita"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "Nuovo contatto",
       "edit_title": "Modifica contatto",
diff --git a/locales/ja/common.json b/locales/ja/common.json
index 9e3c0286..e3f0370c 100644
--- a/locales/ja/common.json
+++ b/locales/ja/common.json
@@ -1816,6 +1816,15 @@
       "cert_imported": "証明書をインポートしました",
       "cert_import_failed": "証明書のインポートに失敗しました"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "新しい連絡先",
       "edit_title": "連絡先を編集",
diff --git a/locales/ko/common.json b/locales/ko/common.json
index 74295523..b89fdf01 100644
--- a/locales/ko/common.json
+++ b/locales/ko/common.json
@@ -1816,6 +1816,15 @@
       "scheduling_uri": "스케줄링 URL",
       "freebusy_uri": "Free/Busy URL"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "새 연락처",
       "edit_title": "연락처 수정",
diff --git a/locales/lv/common.json b/locales/lv/common.json
index 987c6632..070e79db 100644
--- a/locales/lv/common.json
+++ b/locales/lv/common.json
@@ -1812,6 +1812,15 @@
       "scheduling_uri": "Plānošanas URL",
       "freebusy_uri": "Pieejamības URL"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "Jauns kontakts",
       "edit_title": "Rediģēt kontaktu",
diff --git a/locales/nl/common.json b/locales/nl/common.json
index 8b6f09e9..9db32a32 100644
--- a/locales/nl/common.json
+++ b/locales/nl/common.json
@@ -1816,6 +1816,15 @@
       "cert_imported": "Certificaat geïmporteerd",
       "cert_import_failed": "Importeren van certificaat mislukt"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "Nieuw contact",
       "edit_title": "Contact bewerken",
diff --git a/locales/pl/common.json b/locales/pl/common.json
index 7dc7b153..018589c6 100644
--- a/locales/pl/common.json
+++ b/locales/pl/common.json
@@ -1816,6 +1816,15 @@
       "scheduling_uri": "Adres URL planowania",
       "freebusy_uri": "Adres URL wolny/zajęty"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "Nowy kontakt",
       "edit_title": "Edytuj kontakt",
diff --git a/locales/pt/common.json b/locales/pt/common.json
index c6c9c494..820f7d59 100644
--- a/locales/pt/common.json
+++ b/locales/pt/common.json
@@ -1816,6 +1816,15 @@
       "cert_imported": "Certificado importado",
       "cert_import_failed": "Falha ao importar o certificado"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "Novo contato",
       "edit_title": "Editar contato",
diff --git a/locales/ru/common.json b/locales/ru/common.json
index 3b20f3b1..596dc97b 100644
--- a/locales/ru/common.json
+++ b/locales/ru/common.json
@@ -1816,6 +1816,15 @@
       "scheduling_uri": "URL планирования",
       "freebusy_uri": "URL доступности"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "Новый контакт",
       "edit_title": "Редактировать контакт",
diff --git a/locales/uk/common.json b/locales/uk/common.json
index 0ba4ef08..32356e0b 100644
--- a/locales/uk/common.json
+++ b/locales/uk/common.json
@@ -1816,6 +1816,15 @@
       "scheduling_uri": "URL-адреса планування",
       "freebusy_uri": "Вільний/зайнятий URL"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "Новий контакт",
       "edit_title": "Редагувати контакт",
diff --git a/locales/zh/common.json b/locales/zh/common.json
index 8909df13..208af976 100644
--- a/locales/zh/common.json
+++ b/locales/zh/common.json
@@ -1816,6 +1816,15 @@
       "scheduling_uri": "调度 URL",
       "freebusy_uri": "空闲/忙碌 URL"
     },
+    "activity": {
+      "recent_emails": "Recent Emails",
+      "upcoming_events": "Upcoming Events",
+      "no_emails": "No recent emails",
+      "no_events": "No upcoming events",
+      "no_subject": "(No subject)",
+      "no_title": "(No title)",
+      "load_failed": "Failed to load"
+    },
     "form": {
       "create_title": "新联系人",
       "edit_title": "编辑联系人",