diff --git a/ion/src/device/usb/Makefile b/ion/src/device/usb/Makefile
index 7021537ae..586f6d2d6 100644
--- a/ion/src/device/usb/Makefile
+++ b/ion/src/device/usb/Makefile
@@ -17,6 +17,7 @@ usb_objs += $(addprefix ion/src/device/usb/stack/, \
   dfu_functional_descriptor.o\
   interface_descriptor.o\
   language_id_string_descriptor.o \
+  microsoft_os_string_descriptor.o\
   platform_device_capability_descriptor.o\
   streamable.o\
   string_descriptor.o\
diff --git a/ion/src/device/usb/calculator.cpp b/ion/src/device/usb/calculator.cpp
index 5307b32ef..402b28884 100644
--- a/ion/src/device/usb/calculator.cpp
+++ b/ion/src/device/usb/calculator.cpp
@@ -25,6 +25,11 @@ void Calculator::Poll() {
 }
 
 Descriptor * Calculator::descriptor(uint8_t type, uint8_t index) {
+  /* Special case: Microsoft OS String Descriptor should be returned when
+   * searching for string descriptor at index 0xEE. */
+  if (type == m_microsoftOSStringDescriptor.type() && index == 0xEE) {
+    return &m_microsoftOSStringDescriptor;
+  }
   int typeCount = 0;
   for (size_t i=0; i<sizeof(m_descriptors)/sizeof(m_descriptors[0]); i++) {
     Descriptor * descriptor = m_descriptors[i];
diff --git a/ion/src/device/usb/calculator.h b/ion/src/device/usb/calculator.h
index a7f50e7be..6094c57ba 100644
--- a/ion/src/device/usb/calculator.h
+++ b/ion/src/device/usb/calculator.h
@@ -10,6 +10,7 @@
 #include "stack/dfu_functional_descriptor.h"
 #include "stack/interface_descriptor.h"
 #include "stack/language_id_string_descriptor.h"
+#include "stack/microsoft_os_string_descriptor.h"
 #include "stack/string_descriptor.h"
 #include "stack/url_descriptor.h"
 #include "stack/webusb_platform_descriptor.h"
@@ -88,6 +89,7 @@ public:
     m_serialNumberStringDescriptor("12345"),
     m_interfaceStringDescriptor("@Flash/0x08000000/04*016Kg,01*064Kg,07*128Kg"),
     //m_interfaceStringDescriptor("@SRAM/0x20000000/01*256Ke"), //TODO: Add this descriptor to use dfu-util to write in the SRAM
+    m_microsoftOSStringDescriptor(k_microsoftOSVendorCode),
     m_workshopURLDescriptor(URLDescriptor::Scheme::HTTPS, "workshop.numworks.com"),
     m_descriptors{
       &m_deviceDescriptor,             // Type = Device, Index = 0
@@ -117,6 +119,7 @@ private:
   static constexpr uint8_t k_dfuInterfaceAlternateSetting = 0;
   static constexpr uint8_t k_webUSBVendorCode = 1;
   static constexpr uint8_t k_webUSBLandingPageIndex = 1;
+  static constexpr uint8_t k_microsoftOSVendorCode = 2;
   bool getURLCommand(uint8_t * transferBuffer, uint16_t * transferBufferLength, uint16_t transferBufferMaxLength);
   DeviceDescriptor m_deviceDescriptor;
   DFUFunctionalDescriptor m_dfuFunctionalDescriptor;
@@ -129,6 +132,7 @@ private:
   StringDescriptor m_productStringDescriptor;
   StringDescriptor m_serialNumberStringDescriptor;
   StringDescriptor m_interfaceStringDescriptor;
+  MicrosoftOSStringDescriptor m_microsoftOSStringDescriptor;
   URLDescriptor m_workshopURLDescriptor;
 
   Descriptor * m_descriptors[8];
diff --git a/ion/src/device/usb/stack/microsoft_os_string_descriptor.cpp b/ion/src/device/usb/stack/microsoft_os_string_descriptor.cpp
new file mode 100644
index 000000000..2d119dc09
--- /dev/null
+++ b/ion/src/device/usb/stack/microsoft_os_string_descriptor.cpp
@@ -0,0 +1,19 @@
+#include "microsoft_os_string_descriptor.h"
+
+namespace Ion {
+namespace USB {
+namespace Device {
+
+void MicrosoftOSStringDescriptor::push(Channel * c) const {
+  StringDescriptor::push(c);
+  c->push(m_bMSVendorCode);
+  c->push(m_bPad);
+}
+
+uint8_t MicrosoftOSStringDescriptor::bLength() const {
+  return StringDescriptor::bLength() + 2 * sizeof(uint8_t);
+}
+
+}
+}
+}
diff --git a/ion/src/device/usb/stack/microsoft_os_string_descriptor.h b/ion/src/device/usb/stack/microsoft_os_string_descriptor.h
new file mode 100644
index 000000000..9bf2295b6
--- /dev/null
+++ b/ion/src/device/usb/stack/microsoft_os_string_descriptor.h
@@ -0,0 +1,30 @@
+#ifndef ION_DEVICE_USB_STACK_MICROSOFT_OS_STRING_DESCRIPTOR_H
+#define ION_DEVICE_USB_STACK_MICROSOFT_OS_STRING_DESCRIPTOR_H
+
+#include "string_descriptor.h"
+
+namespace Ion {
+namespace USB {
+namespace Device {
+
+class MicrosoftOSStringDescriptor : public StringDescriptor {
+public:
+  constexpr MicrosoftOSStringDescriptor(uint8_t bMSVendorCode) :
+    StringDescriptor("MSFT100"),
+    m_bMSVendorCode(bMSVendorCode),
+    m_bPad(0)
+  {
+  }
+protected:
+  void push(Channel * c) const override;
+  virtual uint8_t bLength() const override;
+private:
+  uint8_t m_bMSVendorCode;
+  uint8_t m_bPad;
+};
+
+}
+}
+}
+
+#endif
diff --git a/ion/src/device/usb/stack/os_string_descriptor.h b/ion/src/device/usb/stack/os_string_descriptor.h
deleted file mode 100644
index 7a466bcb3..000000000
--- a/ion/src/device/usb/stack/os_string_descriptor.h
+++ /dev/null
@@ -1,16 +0,0 @@
-class OSStringDescriptor : public Descriptor {
-public:
-  StringDescriptor(const char * string);
-  void copy(void * target) override {
-    memcpy(this, target, sizeof(Descriptor));
-    // Ensuite, on veut pousser le compat ID et les extended properties
-    ;
-  }
-private:
-  uint8_t bLength;
-  uint8_t bDescriptorType;
-  uint8_t qwSignature[14];
-  uint8_t bMS_VendorCode;
-  uint8_t bPad;
-};
-