diff --git a/__tests__/index.test.ts b/__tests__/index.test.ts
deleted file mode 100644
index 2ad152d3eced827b6d5842ad907213ca3e3bec86..0000000000000000000000000000000000000000
--- a/__tests__/index.test.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-import { describe, it, expect } from "@jest/globals";
-import {add} from "../src";
-
-describe("index test", () => {
-  it("should calculate sum", () => {
-    const sum = add(2, 5);
-    expect(sum).toEqual(7);
-  })
-})
diff --git a/__tests__/outlookHtml.test.ts b/__tests__/outlookHtml.test.ts
new file mode 100644
index 0000000000000000000000000000000000000000..6ff3540a557eaadd45c5da55917dae3ef4ab7ae5
--- /dev/null
+++ b/__tests__/outlookHtml.test.ts
@@ -0,0 +1,99 @@
+import { describe, test, expect } from "@jest/globals";
+import { JSDOM } from "jsdom";
+import HTMLNormalizer from "../src/HTMLNormalizer";
+import { EMAIL_VENDORS } from "../src/constants";
+const fs = require("fs");
+const path = require("path");
+const util = require("util");
+
+// Test cases from https://code.vereign.com/alexey.lunin/outlook-files-upload
+
+const TESTS_GLOBAL_PATH = "/outlook-files-upload/uploads";
+const SENT_HTML_NAME = "s_initialHtmlContent.data";
+const RECEIVED_HTML_NAME = "r_htmlContent.data";
+
+const getNormalizedTestCases = async (
+  testCasesDirName: string
+): Promise<Array<Array<string>>> => {
+  const testsPath = path.resolve(
+    __dirname,
+    `..${TESTS_GLOBAL_PATH}/${testCasesDirName}`
+  );
+
+  const testCasesDirs = fs.readdirSync(testsPath).filter(function (file) {
+    return fs.statSync(testsPath + "/" + file).isDirectory();
+  });
+
+  const results = await Promise.allSettled(
+    testCasesDirs.map(async (dirName) => {
+      const sentHtml = (
+        await util.promisify(fs.readFile)(
+          `${testsPath}/${dirName}/${SENT_HTML_NAME}`
+        )
+      ).toString();
+
+      const receivedHtml = (
+        await util.promisify(fs.readFile)(
+          `${testsPath}/${dirName}/${RECEIVED_HTML_NAME}`
+        )
+      ).toString();
+
+      return {
+        sentHtml,
+        receivedHtml,
+      };
+    })
+  );
+
+  return Object.values(results)
+    .filter((result, index) => {
+      if (result.status === "fulfilled") {
+        return true;
+      } else {
+        console.log(`Invalid test case: ${testCasesDirs[index]}`);
+        return false;
+      }
+    })
+    .map((result: any) => {
+      const sentHtml = result.value.sentHtml;
+      const receivedHtml = result.value.receivedHtml;
+
+      const sentDOM = new JSDOM(sentHtml);
+      const receivedDOM = new JSDOM(receivedHtml);
+
+      const sentNormalizedHtml = HTMLNormalizer.normalizeVendorHtml(
+        sentDOM.window.document,
+        EMAIL_VENDORS.OUTLOOK
+      );
+      const receivedNormalizedHtml = HTMLNormalizer.normalizeVendorHtml(
+        receivedDOM.window.document,
+        EMAIL_VENDORS.OUTLOOK
+      );
+
+      return [sentNormalizedHtml, receivedNormalizedHtml];
+    });
+};
+
+describe("Outlook emails HTML normalization", () => {
+  test("Emails Chrome", async () => {
+    const normalizedCases = await getNormalizedTestCases("chrome");
+    normalizedCases.forEach(([sent, received]) => {
+      expect(received).toContain(sent);
+    });
+  });
+
+  // it("Emails Edge", () => {
+  // })
+  //
+  // it("Emails Gmail", () => {
+  // })
+  //
+  // it("Emails MacOS", () => {
+  // })
+  //
+  // it("Emails Safari", () => {
+  // })
+  //
+  // it("Emails Windows", () => {
+  // })
+});
diff --git a/outlook-files-upload b/outlook-files-upload
index 92e510e217ecc2693ecd9b7dbddb3cba1c0645dc..ada9633a773c4c0c88f36adfa7ce7f022aababb3 160000
--- a/outlook-files-upload
+++ b/outlook-files-upload
@@ -1 +1 @@
-Subproject commit 92e510e217ecc2693ecd9b7dbddb3cba1c0645dc
+Subproject commit ada9633a773c4c0c88f36adfa7ce7f022aababb3
diff --git a/src/HTMLNormalizer/index.ts b/src/HTMLNormalizer/index.ts
index eddde0e98229002067914b228da6d8434bcc8c63..5a404bb97ec11626d161e4eb38928b5572c2c1f9 100644
--- a/src/HTMLNormalizer/index.ts
+++ b/src/HTMLNormalizer/index.ts
@@ -1,3 +1,5 @@
-import {normalizeVendorHtml} from "./HTMLNormalizer";
+import { normalizeVendorHtml } from "./HTMLNormalizer";
 
-export default normalizeVendorHtml;
+export default {
+  normalizeVendorHtml,
+};
diff --git a/tsconfig.json b/tsconfig.json
index e880418b6314b5810989ea19b7e21fbe4241ce79..81779e45db08fbb0f3a3121ca5f40d59cb435034 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "module": "commonjs",
-    "target": "es2015",
+    "target": "es2020",
     "declaration": true,
     "outDir": "./dist",
     "allowJs": true