new file mode 100644
--- /dev/null
+++ b/taskcluster/ci/release-msix-push/kind.yml
@@ -0,0 +1,41 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+---
+loader: gecko_taskgraph.loader.transform:loader
+
+transforms:
+    - gecko_taskgraph.transforms.release:run_on_releases
+    - gecko_taskgraph.transforms.release_deps:transforms
+    - gecko_taskgraph.transforms.release_msix_push:transforms
+    - gecko_taskgraph.transforms.task:transforms
+
+kind-dependencies:
+    - repackage-shippable-l10n-msix
+
+job-defaults:
+    description: Pushes msix archives to Microsoft Store
+    run-on-projects: []  # to make sure this never runs as part of CI
+    run-on-releases: [beta]
+    shipping-phase: ship
+    treeherder:
+        platform: win32-shippable/opt
+        kind: build
+        tier: 2
+    worker-type:
+        by-release-level:
+            production: scriptworker-k8s/gecko-3-pushmsix
+            staging: scriptworker-k8s/gecko-1-pushmsix
+    worker:
+        implementation: push-msix
+        channel:
+            by-release-type:
+                beta: beta
+                release: release
+                default: mock
+
+jobs:
+    firefox:
+        shipping-product: firefox
+        treeherder:
+            symbol: MSIX(push)

--- a/taskcluster/docs/kinds.rst
+++ b/taskcluster/docs/kinds.rst
@@ -560,16 +560,20 @@ repackage-signing-msix
 ----------------------
 Repackage-signing-msix takes Windows MSIX packages produced in ```repackage-msix``` and signs them.
 
 repackage-signing-shippable-l10n-msix
 -------------------------------------
 Repackage-signing-shippable-l10n-msix takes Windows MSIX packages produced in
 ```repackage-signing-shippable-l10n-msix``` and signs them.
 
+release-msix-push
+--------------------
+Pushes msix repackage to the Microsoft Store.
+
 repo-update
 -----------
 Repo-Update tasks are tasks that perform some action on the project repo itself,
 in order to update its state in some way.
 
 partials
 --------
 Partials takes the complete.mar files produced in previous tasks and generates partial

new file mode 100644
--- /dev/null
+++ b/taskcluster/gecko_taskgraph/transforms/release_msix_push.py
@@ -0,0 +1,78 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+"""
+Transform the release-msix-push kind into an actual task description.
+"""
+
+
+from gecko_taskgraph.transforms.base import TransformSequence
+from gecko_taskgraph.transforms.task import task_description_schema
+from gecko_taskgraph.util.attributes import release_level
+from gecko_taskgraph.util.schema import optionally_keyed_by, resolve_keyed_by, Schema
+from gecko_taskgraph.util.scriptworker import add_scope_prefix
+
+from voluptuous import Optional, Required
+
+push_msix_description_schema = Schema(
+    {
+        Required("name"): str,
+        Required("job-from"): task_description_schema["job-from"],
+        Required("dependencies"): task_description_schema["dependencies"],
+        Required("description"): task_description_schema["description"],
+        Required("treeherder"): task_description_schema["treeherder"],
+        Required("run-on-projects"): task_description_schema["run-on-projects"],
+        Required("worker-type"): optionally_keyed_by("release-level", str),
+        Required("worker"): object,
+        Optional("scopes"): [str],
+        Required("shipping-phase"): task_description_schema["shipping-phase"],
+        Required("shipping-product"): task_description_schema["shipping-product"],
+        Optional("extra"): task_description_schema["extra"],
+        Optional("attributes"): task_description_schema["attributes"],
+    }
+)
+
+transforms = TransformSequence()
+transforms.add_validate(push_msix_description_schema)
+
+
+@transforms.add
+def make_task_description(config, jobs):
+    for job in jobs:
+
+        job["worker"]["upstream-artifacts"] = generate_upstream_artifacts(
+            job["dependencies"]
+        )
+
+        resolve_keyed_by(
+            job,
+            "worker.channel",
+            item_name=job["name"],
+            **{"release-type": config.params["release_type"]},
+        )
+        resolve_keyed_by(
+            job,
+            "worker-type",
+            item_name=job["name"],
+            **{"release-level": release_level(config.params["project"])},
+        )
+        if release_level(config.params["project"]) == "production":
+            job.setdefault("scopes", []).append(
+                add_scope_prefix(
+                    config,
+                    "microsoftstore:{}".format(job["worker"]["channel"]),
+                )
+            )
+
+        yield job
+
+
+def generate_upstream_artifacts(dependencies):
+    return [
+        {
+            "taskId": {"task-reference": f"<{task_kind}>"},
+            "taskType": "build",
+            "paths": ["public/build/target.store.msix"],
+        }
+        for task_kind in dependencies.keys()
+    ]

--- a/taskcluster/gecko_taskgraph/transforms/task.py
+++ b/taskcluster/gecko_taskgraph/transforms/task.py
@@ -1199,16 +1199,38 @@ def build_push_flatpak_payload(config, t
 
     task_def["payload"] = {
         "channel": worker["channel"],
         "upstreamArtifacts": worker["upstream-artifacts"],
     }
 
 
 @payload_builder(
+    "push-msix",
+    schema={
+        Required("channel"): str,
+        Required("upstream-artifacts"): [
+            {
+                Required("taskId"): taskref_or_string,
+                Required("taskType"): str,
+                Required("paths"): [str],
+            }
+        ],
+    },
+)
+def build_push_msix_payload(config, task, task_def):
+    worker = task["worker"]
+
+    task_def["payload"] = {
+        "channel": worker["channel"],
+        "upstreamArtifacts": worker["upstream-artifacts"],
+    }
+
+
+@payload_builder(
     "shipit-shipped",
     schema={
         Required("release-name"): str,
     },
 )
 def build_ship_it_shipped_payload(config, task, task_def):
     worker = task["worker"]