diff --git a/next.config.ts b/next.config.ts
index aa1c5aa..976f677 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -1,8 +1,8 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  // The SDK ships ESM/TS; let Next transpile it.
-  transpilePackages: ["@abe-kap/appshell-sdk"],
+  // The SDKs ship ESM; let Next transpile them.
+  transpilePackages: ["@abe-kap/appshell-sdk", "@insignia/iios-messaging-ui"],
   // The browser calls the Shell BFF same-origin under /shell (so the HttpOnly
   // session cookie flows). We deliberately use /shell (NOT /api) to avoid
   // clobbering the existing /api/geo route. Point BFF_ORIGIN at the deployed BFF.
diff --git a/package-lock.json b/package-lock.json
index 3a0245f..714de0f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10,6 +10,7 @@
       "dependencies": {
         "@abe-kap/appshell-sdk": "^0.2.6",
         "@insignia/iios-kernel-client": "^0.1.4",
+        "@insignia/iios-messaging-ui": "file:../iios/packages/iios-messaging-ui/insignia-iios-messaging-ui-0.1.0.tgz",
         "clsx": "^2.1.1",
         "lucide-react": "^1.21.0",
         "next": "16.2.9",
@@ -1026,6 +1027,20 @@
         "socket.io-client": "^4.8.1"
       }
     },
+    "node_modules/@insignia/iios-messaging-ui": {
+      "version": "0.1.0",
+      "resolved": "file:../iios/packages/iios-messaging-ui/insignia-iios-messaging-ui-0.1.0.tgz",
+      "integrity": "sha512-6pSVWACjex1sXWzVqx+42rM6vgWEJ+1ud5y3DLKogJiQmfgFZgCB8vTw0PN/5FECugXC7iGuc9rV9RsHsP+EDw==",
+      "peerDependencies": {
+        "@insignia/iios-kernel-client": "*",
+        "react": ">=18"
+      },
+      "peerDependenciesMeta": {
+        "@insignia/iios-kernel-client": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
diff --git a/package.json b/package.json
index 726f655..3960434 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
   "dependencies": {
     "@abe-kap/appshell-sdk": "^0.2.6",
     "@insignia/iios-kernel-client": "^0.1.4",
+    "@insignia/iios-messaging-ui": "file:../iios/packages/iios-messaging-ui/insignia-iios-messaging-ui-0.1.0.tgz",
     "clsx": "^2.1.1",
     "lucide-react": "^1.21.0",
     "next": "16.2.9",
diff --git a/src/app/dashboard/dashboard.css b/src/app/dashboard/dashboard.css
index de8381a..51ba53f 100644
--- a/src/app/dashboard/dashboard.css
+++ b/src/app/dashboard/dashboard.css
@@ -133,6 +133,20 @@
   
   .dash-content { padding: 22px 28px 40px; width: 100%; }
   .sec-title { font-size: 15px; font-weight: 700; margin: 6px 0 14px; }
+
+  /* Host for @insignia/iios-messaging-ui: a fixed-height card that maps the SDK's --miu-* tokens
+     onto the CRM design system, so the drop-in SDK matches the rest of the app. */
+  .dash-root .miu-host { height: 620px; border: 1px solid var(--border); border-radius: 16px; overflow: hidden; }
+  .dash-root .miu-host .miu-messenger {
+    --miu-bg: var(--bg);
+    --miu-panel: var(--panel);
+    --miu-panel-2: var(--panel-2);
+    --miu-border: var(--border);
+    --miu-text: var(--text);
+    --miu-muted: var(--muted);
+    --miu-accent: var(--orange);
+    --miu-accent-text: #1a1206;
+  }
   
   /* ---- grid helpers ---- */
   .grid { display: grid; gap: 16px; }
diff --git a/src/components/dashboard/dashboard.tsx b/src/components/dashboard/dashboard.tsx
index d052a4e..0fb2892 100644
--- a/src/components/dashboard/dashboard.tsx
+++ b/src/components/dashboard/dashboard.tsx
@@ -15,7 +15,7 @@ import { Support } from "./support";
 import { Rules } from "./rules";
 import { AiAssistant } from "./ai-assistant";
 import { TeamManagement } from "./team-management";
-import { Messenger } from "./messenger";
+import { MessengerSdk } from "./messenger-sdk";
 import { Inbox } from "./inbox";
 import "../../app/dashboard/dashboard.css";
 
@@ -47,7 +47,7 @@ export function Dashboard() {
               : active === "support" ? <Support />
               : active === "rules" ? <Rules />
               : active === "ai" ? <AiAssistant />
-              : active === "messenger" ? <Messenger />
+              : active === "messenger" ? <MessengerSdk />
               : active === "inbox" ? <Inbox />
               : active === "team" ? <TeamManagement />
               : <ComingSoon title={title} icon={item?.icon ?? "dashboard"} onGo={setActive} />}
diff --git a/src/components/dashboard/messenger-sdk.tsx b/src/components/dashboard/messenger-sdk.tsx
new file mode 100644
index 0000000..7e440a3
--- /dev/null
+++ b/src/components/dashboard/messenger-sdk.tsx
@@ -0,0 +1,72 @@
+"use client";
+
+// The CRM messenger, now rendered by the shared @insignia/iios-messaging-ui SDK instead of a
+// bespoke in-CRM implementation. The CRM only supplies an adapter (transport) + theming; all the
+// UI + messaging logic lives in the SDK. Live path = the be-crm data door (CrmMessagingAdapter);
+// demo path = the SDK's own MockAdapter.
+
+import { useMemo } from "react";
+import { useAppShell, useAuth } from "@abe-kap/appshell-sdk/react";
+import { MessagingProvider, Messenger as SdkMessenger, type MessagingAdapter } from "@insignia/iios-messaging-ui";
+import { MockAdapter } from "@insignia/iios-messaging-ui/adapters/mock";
+import "@insignia/iios-messaging-ui/styles.css";
+import { isShellConfigured } from "@/lib/appshell";
+import { CrmMessagingAdapter, type DataDoor } from "@/lib/crm-messaging-adapter";
+import { PageHead } from "./ui";
+
+const SHELL = isShellConfigured();
+
+export function MessengerSdk() {
+  return (
+    <div className="view">
+      <PageHead
+        eyebrow="Communication"
+        title="Messenger"
+        subtitle="Chat with your team and clients — rendered by the messaging SDK"
+        icon="send"
+      />
+      {!SHELL && (
+        <div
+          style={{
+            margin: "0 0 14px",
+            padding: "8px 14px",
+            borderRadius: 10,
+            background: "var(--panel-2)",
+            color: "var(--muted)",
+            fontSize: 13,
+            border: "1px solid var(--border)",
+          }}
+        >
+          Demo mode — running on the SDK&apos;s mock adapter.
+        </div>
+      )}
+      <div className="miu-host">{SHELL ? <LiveHost /> : <DemoHost />}</div>
+    </div>
+  );
+}
+
+// SHELL is a build-time constant, so exactly one of these mounts for the life of the app
+// (Rules-of-Hooks safe — the other branch never renders).
+function DemoHost() {
+  const adapter = useMemo<MessagingAdapter>(() => new MockAdapter(), []);
+  return (
+    <MessagingProvider adapter={adapter}>
+      <SdkMessenger />
+    </MessagingProvider>
+  );
+}
+
+function LiveHost() {
+  const { sdk } = useAppShell();
+  const { user } = useAuth();
+  const adapter = useMemo<MessagingAdapter | null>(
+    () => (user?.id ? new CrmMessagingAdapter(sdk as unknown as DataDoor, user.id) : null),
+    [sdk, user?.id],
+  );
+  if (!adapter) return <div className="miu-empty">Loading…</div>;
+  return (
+    <MessagingProvider adapter={adapter}>
+      <SdkMessenger />
+    </MessagingProvider>
+  );
+}
diff --git a/src/lib/crm-messaging-adapter.ts b/src/lib/crm-messaging-adapter.ts
new file mode 100644
index 0000000..899bfb7
--- /dev/null
+++ b/src/lib/crm-messaging-adapter.ts
@@ -0,0 +1,165 @@
+// The CRM's implementation of the SDK's MessagingAdapter, over the be-crm data door
+// (appshell `crm.messenger.*`). This is how the CRM consumes @insignia/iios-messaging-ui
+// instead of embedding its own messenger: the SDK renders, this adapter transports.
+//
+// Data (list/open/history/send) goes through the BFF, which attaches the session + tenancy
+// server-side. Live updates are polled here for a first cut; realtime (the IIOS socket the CRM
+// already opens in messenger-socket.tsx) can be layered in by emitting into the same registry.
+
+import type {
+  Conversation,
+  Membership,
+  Message,
+  MessageEvent,
+  MessagingAdapter,
+  SendOpts,
+  Unsubscribe,
+} from "@insignia/iios-messaging-ui";
+
+/** The imperative appshell data door (useAppShell().sdk). Typed structurally so we don't couple to its class. */
+export interface DataDoor {
+  query<T>(action: string, variables?: Record<string, unknown>): Promise<T>;
+  command<T>(action: string, variables?: Record<string, unknown>): Promise<T>;
+}
+
+interface DirectoryDTO { id: string; displayName: string; kind: "staff" | "customer" }
+interface ConversationDTO {
+  threadId: string; subject: string | null; membership: Membership | null;
+  participants: string[]; unread: number; lastMessage?: string; lastAt?: string;
+}
+interface MessageDTO { interactionId: string; actorId: string | null; kind: string; occurredAt: string; text: string | null }
+
+const POLL_MS = 4000;
+
+interface Poll {
+  cbs: Set<(e: MessageEvent) => void>;
+  seen: Set<string>;
+  primed: boolean;
+  timer: ReturnType<typeof setInterval> | null;
+}
+
+export class CrmMessagingAdapter implements MessagingAdapter {
+  private names: Map<string, string> | null = null;
+  private readonly polls = new Map<string, Poll>();
+
+  constructor(private readonly sdk: DataDoor, private readonly me: string) {}
+
+  currentActorId(): string {
+    return this.me;
+  }
+
+  async listConversations(): Promise<Conversation[]> {
+    const [convs, names] = await Promise.all([
+      this.sdk.query<ConversationDTO[]>("crm.messenger.conversation.list", {}),
+      this.directory(),
+    ]);
+    return convs.map((c) => this.toConversation(c, names));
+  }
+
+  async openThread(p: { participantIds: string[]; membership?: Membership; subject?: string }): Promise<{ threadId: string }> {
+    const res = await this.sdk.command<{ threadId: string }>("crm.messenger.conversation.open", {
+      participantIds: p.participantIds,
+      ...(p.membership ? { membership: p.membership } : {}),
+      ...(p.subject ? { subject: p.subject } : {}),
+    });
+    return { threadId: res.threadId };
+  }
+
+  async history(threadId: string): Promise<Message[]> {
+    const msgs = await this.sdk.query<MessageDTO[]>("crm.messenger.history", { threadId });
+    return msgs.map((m) => this.toMessage(m));
+  }
+
+  async send(threadId: string, content: string, opts?: SendOpts): Promise<Message> {
+    const m = await this.sdk.command<MessageDTO>("crm.messenger.send", {
+      threadId,
+      content,
+      ...(opts?.attachment ? { attachment: opts.attachment } : {}),
+    });
+    const msg = this.toMessage(m);
+    // Mark it seen so the poll doesn't re-emit our own message on top of useMessages' optimistic row.
+    this.polls.get(threadId)?.seen.add(msg.id);
+    return msg;
+  }
+
+  subscribe(threadId: string, cb: (e: MessageEvent) => void): Unsubscribe {
+    let poll = this.polls.get(threadId);
+    if (!poll) {
+      poll = { cbs: new Set(), seen: new Set(), primed: false, timer: null };
+      this.polls.set(threadId, poll);
+      const tick = async (): Promise<void> => {
+        const p = this.polls.get(threadId);
+        if (!p) return;
+        try {
+          const msgs = await this.sdk.query<MessageDTO[]>("crm.messenger.history", { threadId });
+          for (const m of msgs) {
+            if (p.seen.has(m.interactionId)) continue;
+            p.seen.add(m.interactionId);
+            // The first pass just records what's already loaded (useMessages fetched history);
+            // only genuinely new messages after that are pushed to the UI.
+            if (p.primed) p.cbs.forEach((f) => f({ kind: "message", message: this.toMessage(m) }));
+          }
+          p.primed = true;
+        } catch {
+          /* transient BFF error — try again next tick */
+        }
+      };
+      void tick();
+      poll.timer = setInterval(tick, POLL_MS);
+    }
+    poll.cbs.add(cb);
+    return () => {
+      const p = this.polls.get(threadId);
+      if (!p) return;
+      p.cbs.delete(cb);
+      if (p.cbs.size === 0) {
+        if (p.timer) clearInterval(p.timer);
+        this.polls.delete(threadId);
+      }
+    };
+  }
+
+  sendTyping(): void {
+    // No BFF verb for typing; realtime is a follow-up (the IIOS socket). No-op keeps the contract.
+  }
+
+  async markRead(): Promise<void> {
+    // No BFF verb for read receipts here; follow-up via the socket. No-op resolves the contract.
+  }
+
+  // ── mapping ────────────────────────────────────────────────────
+  private async directory(): Promise<Map<string, string>> {
+    if (!this.names) {
+      const dir = await this.sdk.query<DirectoryDTO[]>("crm.messenger.directory", { kind: "all", limit: 200 });
+      this.names = new Map(dir.map((d) => [d.id, d.displayName]));
+    }
+    return this.names;
+  }
+
+  private toConversation(c: ConversationDTO, names: Map<string, string>): Conversation {
+    const others = c.participants.filter((p) => p !== this.me);
+    const title =
+      c.subject?.trim() ||
+      others.map((id) => names.get(id) ?? id).join(", ") ||
+      "Conversation";
+    return {
+      threadId: c.threadId,
+      title,
+      subject: c.subject,
+      membership: c.membership,
+      participants: c.participants,
+      unread: c.unread,
+      ...(c.lastMessage ? { lastMessage: c.lastMessage } : {}),
+      ...(c.lastAt ? { lastAt: c.lastAt } : {}),
+    };
+  }
+
+  private toMessage(m: MessageDTO): Message {
+    return {
+      id: m.interactionId,
+      actorId: m.actorId,
+      text: m.text ?? "",
+      at: m.occurredAt,
+    };
+  }
+}