diff --git a/3rdparty/o2/src/o2skydrive.cpp b/3rdparty/o2/src/o2skydrive.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c8607d4c5eab477880f8640ece37f88a4af42bf8
--- /dev/null
+++ b/3rdparty/o2/src/o2skydrive.cpp
@@ -0,0 +1,121 @@
+#include <QDebug>
+#include <QDateTime>
+#include <QMap>
+#include <QString>
+#include <QStringList>
+#if QT_VERSION >= 0x050000
+#include <QUrlQuery>
+#endif
+
+#include "o2skydrive.h"
+#include "o2globals.h"
+
+#define trace() if (1) qDebug()
+// define trace() if (0) qDebug()
+
+O2Skydrive::O2Skydrive(QObject *parent): O2(parent) {
+    setRequestUrl("https://login.live.com/oauth20_authorize.srf");
+    setTokenUrl("https://login.live.com/oauth20_token.srf");
+    setRefreshTokenUrl("https://login.live.com/oauth20_token.srf");
+}
+
+void O2Skydrive::link() {
+    trace() << "O2::link";
+    if (linked()) {
+        trace() << "Linked already";
+        return;
+    }
+
+    redirectUri_ = QString("https://login.live.com/oauth20_desktop.srf");
+
+    // Assemble intial authentication URL
+    QList<QPair<QString, QString> > parameters;
+    parameters.append(qMakePair(QString(O2_OAUTH2_RESPONSE_TYPE), (grantFlow_ == GrantFlowAuthorizationCode) ? QString(O2_OAUTH2_CODE) : QString(O2_OAUTH2_TOKEN)));
+    parameters.append(qMakePair(QString(O2_OAUTH2_CLIENT_ID), clientId_));
+    parameters.append(qMakePair(QString(O2_OAUTH2_REDIRECT_URI), redirectUri_));
+    parameters.append(qMakePair(QString(O2_OAUTH2_SCOPE), scope_));
+
+    // Show authentication URL with a web browser
+    QUrl url(requestUrl_);
+#if QT_VERSION < 0x050000
+    url.setQueryItems(parameters);
+#else
+    QUrlQuery query(url);
+    query.setQueryItems(parameters);
+    url.setQuery(query);
+#endif
+    emit openBrowser(url);
+}
+
+void O2Skydrive::redirected(const QUrl &url) {
+    trace() << "O2::redirected" << url;
+
+    emit closeBrowser();
+
+    if (grantFlow_ == GrantFlowAuthorizationCode) {
+        // Get access code
+        QString urlCode;
+#if QT_VERSION < 0x050000
+        urlCode = url.queryItemValue(O2_OAUTH2_CODE);
+#else
+        QUrlQuery query(url);
+        urlCode = query.queryItemValue(O2_OAUTH2_CODE);
+#endif
+        if (urlCode.isEmpty()) {
+            trace() << " Code not received";
+            emit linkingFailed();
+            return;
+        }
+        setCode(urlCode);
+
+        // Exchange access code for access/refresh tokens
+        QNetworkRequest tokenRequest(tokenUrl_);
+        tokenRequest.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
+        QMap<QString, QString> parameters;
+        parameters.insert(O2_OAUTH2_CODE, code());
+        parameters.insert(O2_OAUTH2_CLIENT_ID, clientId_);
+        parameters.insert(O2_OAUTH2_CLIENT_SECRET, clientSecret_);
+        parameters.insert(O2_OAUTH2_REDIRECT_URI, redirectUri_);
+        parameters.insert(O2_OAUTH2_GRANT_TYPE, O2_AUTHORIZATION_CODE);
+        QByteArray data = buildRequestBody(parameters);
+        QNetworkReply *tokenReply = manager_->post(tokenRequest, data);
+        timedReplies_.add(tokenReply);
+        connect(tokenReply, SIGNAL(finished()), this, SLOT(onTokenReplyFinished()), Qt::QueuedConnection);
+        connect(tokenReply, SIGNAL(error(QNetworkReply::NetworkError)), this, SLOT(onTokenReplyError(QNetworkReply::NetworkError)), Qt::QueuedConnection);
+    } else {
+        // Get access token
+        QString urlToken = "";
+        QString urlRefreshToken = "";
+        int urlExpiresIn = 0;
+
+        QStringList parts = url.toString().split("#");
+        if (parts.length() > 1) {
+            foreach (QString item, parts[1].split("&")) {
+                int index = item.indexOf("=");
+                if (index == -1) {
+                    continue;
+                }
+                QString key = item.left(index);
+                QString value = item.mid(index + 1);
+                trace() << "" << key;
+                if (key == O2_OAUTH2_ACCESS_TOKEN) {
+                    urlToken = value;
+                } else if (key == O2_OAUTH2_EXPIRES_IN) {
+                    urlExpiresIn = value.toInt();
+                } else if (key == O2_OAUTH2_REFRESH_TOKEN) {
+                    urlRefreshToken = value;
+                }
+            }
+        }
+
+        setToken(urlToken);
+        setRefreshToken(urlRefreshToken);
+        setExpires(QDateTime::currentMSecsSinceEpoch() / 1000 + urlExpiresIn);
+        if (urlToken.isEmpty()) {
+            emit linkingFailed();
+        } else {
+            emit linkedChanged();
+            emit linkingSucceeded();
+        }
+    }
+}