diff --git a/back/db/api.js b/back/db/api.js
index 09ea2a7..5a25060 100644
--- a/back/db/api.js
+++ b/back/db/api.js
@@ -1,6 +1,5 @@
-const { db, execQueryAsync, execQueryAsyncWithId } = require("./db.js");
+const { execQueryAsync, execQueryAsyncWithId } = require("./db.js");
 const { queryCcId, queryToId, queryFromId } = require("./utils/addressQueries.js");
-const DEBUG = require("../utils/debug").DEBUG;
 
 async function registerAccount(userId, pwd, xoauth, xoauth2, host, port, tls) {
     const query = `
diff --git a/back/db/db.js b/back/db/db.js
index 9f179dd..a245b7c 100644
--- a/back/db/db.js
+++ b/back/db/db.js
@@ -1,7 +1,6 @@
 const mysql = require("mysql");
+const { logger } = require("../system/Logger");
 const MYSQL = require("./config.json").mysql;
-const DEBUG = require("../utils/debug.js").DEBUG;
-
 
 const db = mysql.createConnection({
     host: MYSQL.host,
@@ -12,9 +11,9 @@ const db = mysql.createConnection({
 
 db.connect(function (err) {
     if (err) {
-        DEBUG.log("Impossible de se connecter", err.code);
+        logger.error(`Unable to connect database ${err.code}`);
     } else {
-        DEBUG.log("Database successfully connected");
+        logger.log("Database successfully connected");
     }
 });
 
@@ -45,7 +44,7 @@ function execQueryAsyncWithId(query, values) {
 function execQuery(query, values) {
     db.query(query, values, (err, results, fields) => {
         if (err) {
-            DEBUG.log(err);
+            logger.err(err);
             throw (err);
         }
         return results;
diff --git a/back/db/mail.js b/back/db/mail.js
index 8e80a8c..bb034b3 100644
--- a/back/db/mail.js
+++ b/back/db/mail.js
@@ -1,6 +1,4 @@
 const { execQueryAsync, execQueryAsyncWithId } = require("./db.js");
-const DEBUG = require("../utils/debug").DEBUG;
-
 
 async function getAddresseId(email, name) {
     const localpart = email.split("@")[0];
diff --git a/back/db/saveMessage.js b/back/db/saveMessage.js
index bf0a82f..4c673b6 100644
--- a/back/db/saveMessage.js
+++ b/back/db/saveMessage.js
@@ -1,6 +1,5 @@
 const { transformEmojis } = require("../utils/string.js");
 const { db, execQuery, execQueryAsync, execQueryAsyncWithId } = require("./db.js");
-const DEBUG = require("../utils/debug").DEBUG;
 
 async function registerMessage(timestamp, rfc822size, messageId) {
     const query = `
diff --git a/back/db/saveMessageApp.js b/back/db/saveMessageApp.js
index e556f7b..7cc11e6 100644
--- a/back/db/saveMessageApp.js
+++ b/back/db/saveMessageApp.js
@@ -1,7 +1,6 @@
 const { transformEmojis } = require("../utils/string.js");
 const { db, execQueryAsync, execQueryAsyncWithId, execQuery } = require("./db.js");
 const { queryFromId, queryToId, queryCcId } = require("./utils/addressQueries.js");
-const DEBUG = require("../utils/debug").DEBUG;
 
 async function createRoom(roomName, ownerId, messageId) {
     roomName = transformEmojis(roomName);
diff --git a/back/mails/imap/Box.js b/back/mails/imap/Box.js
index 9b3e592..3502593 100644
--- a/back/mails/imap/Box.js
+++ b/back/mails/imap/Box.js
@@ -1,5 +1,5 @@
 const { getMailbox, updateMailbox } = require("../../db/imap/imap");
-const { DEBUG } = require("../../utils/debug");
+const { logger } = require("../../system/Logger");
 const { registerMessageInApp } = require("../saveMessage");
 const { saveMessage } = require("../storeMessage");
 
@@ -17,7 +17,7 @@ class Box {
 
         const readOnly = true;
         this.imap.openBox(this.boxName, readOnly, (err, box) => {
-            if (err) DEBUG.log(err);
+            if (err) logger.error(err);
             this.sync(this.box.uidnext, box.uidnext);
         });
     }
@@ -38,7 +38,7 @@ class Box {
         });
 
         f.once("error", (err) => {
-            DEBUG.log("Fetch error: " + err);
+            logger.error("Fetch error: " + err);
         });
 
         f.once("end", async () => {
diff --git a/back/mails/imap/ImapInstance.js b/back/mails/imap/ImapInstance.js
index e6526fb..f32e1bc 100644
--- a/back/mails/imap/ImapInstance.js
+++ b/back/mails/imap/ImapInstance.js
@@ -1,6 +1,6 @@
 const Imap = require("imap");
 const { getAllMailboxes, registerMailbox } = require("../../db/imap/imap");
-const { DEBUG } = require("../../utils/debug");
+const { logger } = require("../../system/Logger");
 const { Box } = require("./Box");
 
 class ImapInstance {
@@ -13,7 +13,7 @@ class ImapInstance {
             port: account.port,
             tls: account.tls,
         });
-    
+
         this.account = account;
         this.boxes = [];
 
@@ -21,16 +21,16 @@ class ImapInstance {
          * IMAP
          */
         this.imap.once("ready", () => {
-            DEBUG.log("imap connected")
+            logger.log("Imap connected for " + this.account.user);
             this.imapReady();
         });
 
         this.imap.once("error", function (err) {
-            DEBUG.log(err);
+            logger.error("Imap error for " + this.account.user + ": " + err);
         });
-        
+
         this.imap.once("end", function () {
-            DEBUG.log("Connection ended");
+            logger.log("Connection ended for " + this.account.user);
         });
 
         this.imap.connect();
@@ -41,8 +41,8 @@ class ImapInstance {
             if (mailboxes.length > 0) {
                 this.boxes.push(new Box(this.imap, mailboxes[0].mailbox_id, mailboxes[0].mailbox_name));
             } else {
-                this.imap.getBoxes('', (err, boxes) => {
-                    if (err) DEBUG.log(err);
+                this.imap.getBoxes("", (err, boxes) => {
+                    if (err) logger.error(err);
                     const allBoxName = this.getAllBox(boxes);
                     registerMailbox(this.account.id, allBoxName).then((mailboxId) => {
                         this.boxes.push(new Box(this.imap, mailboxId, allBoxName));
@@ -55,19 +55,21 @@ class ImapInstance {
     getAllBox(boxes) {
         // ideally we should get the all box to get all messages
         let allBox;
-        Object.keys(boxes).forEach(key => {
-            if (key === 'INBOX') return;
+        Object.keys(boxes).forEach((key) => {
+            if (key === "INBOX") return;
+            if (allBox.includes("/")) return;
             allBox = key;
             Object.keys(boxes[key].children).forEach((childBoxes) => {
-                if (boxes[key].children[childBoxes].attribs.includes('\\All')) {
-                    allBox += '/' + childBoxes;
+                if (boxes[key].children[childBoxes].attribs.includes("\\All")) {
+                    allBox += "/" + childBoxes;
                 }
             });
         });
+        if (!allBox.includes("/")) logger.warn("Did not find 'All' mailbox");
         return allBox;
     }
 }
 
 module.exports = {
-    ImapInstance
-}
\ No newline at end of file
+    ImapInstance,
+};
diff --git a/back/mails/imap/ImapSync.js b/back/mails/imap/ImapSync.js
index 71cbc7e..783e248 100644
--- a/back/mails/imap/ImapSync.js
+++ b/back/mails/imap/ImapSync.js
@@ -1,5 +1,5 @@
 const { getAllAccounts } = require("../../db/imap/imap");
-const { DEBUG } = require("../../utils/debug");
+const { logger } = require("../../system/Logger");
 const { ImapInstance } = require("./ImapInstance");
 
 class ImapSync {
@@ -14,7 +14,7 @@ class ImapSync {
                 this.addInstance(accounts[i]);
             }
         }).catch((err) => {
-            DEBUG.log(err);
+            logger.error(err);
         });
     }
 
diff --git a/back/mails/storeMessage.js b/back/mails/storeMessage.js
index fc18a56..4b46819 100644
--- a/back/mails/storeMessage.js
+++ b/back/mails/storeMessage.js
@@ -1,5 +1,4 @@
 const { getAddresseId } = require("../db/mail");
-const { DEBUG } = require("../utils/debug");
 const { simpleParser } = require("mailparser");
 const moment = require("moment");
 const {
@@ -13,6 +12,7 @@ const {
 } = require("../db/saveMessage");
 
 const { getFieldId } = require("../db/mail");
+const { logger } = require("../system/Logger");
 
 function saveMessage(attrs, mailboxId, imap) {
     const envelope = attrs.envelope;
@@ -54,14 +54,14 @@ function saveMessage(attrs, mailboxId, imap) {
                     });
                 });
                 f.once("error", function (err) {
-                    console.log("Fetch error: " + err);
+                    logger.warn("Fetch error: " + err);
                 });
                 f.once("end", function () {
-                    DEBUG.log("Done fetching data of "+messageID);
+                    logger.log("Done fetching data of " + messageID);
                 });
             })
             .catch((err) => {
-                DEBUG.log("Unable to register message: " + err);
+                logger.warn("Unable to register message: " + err);
                 reject(err);
             });
     });
@@ -97,8 +97,8 @@ async function saveFromParsedData(parsed, messageId) {
                         messageId,
                         fieldId,
                         bodypartId,
-                        undefined,  // todo ?
-                        undefined
+                        undefined, // todo ?
+                        undefined,
                     );
                 });
             });
@@ -109,7 +109,7 @@ async function saveFromParsedData(parsed, messageId) {
             // other field are not important and can be retrieved in source
             return;
         } else {
-            DEBUG.log("doesn't know key: " + key);
+            logger.warn("doesn't know key: " + key);
             return;
         }
     });
@@ -121,8 +121,8 @@ module.exports = {
     saveMessage,
 };
 
-if (process.env['NODE_DEV'] == 'TEST') {
+if (process.env["NODE_DEV"] == "TEST") {
     module.exports = {
-        saveFromParsedData
+        saveFromParsedData,
     };
-}
\ No newline at end of file
+}
diff --git a/back/utils/debug.js b/back/utils/debug.js
deleted file mode 100644
index ff14596..0000000
--- a/back/utils/debug.js
+++ /dev/null
@@ -1,9 +0,0 @@
-const DEBUG = (function () {
-    const timestamp = function () {};
-    timestamp.toString = () => "[" + new Date().toLocaleString() + "]";
-    return { log: console.log.bind(console, "%s", timestamp) };
-})();
-
-module.exports = {
-    DEBUG,
-};
diff --git a/front/src/store/models/Thread.js b/front/src/store/models/Thread.js
index e69de29..df33e87 100644
--- a/front/src/store/models/Thread.js
+++ b/front/src/store/models/Thread.js
@@ -0,0 +1,5 @@
+export default class Thread {
+    constructor (roomId, name) {
+        
+    }
+}
\ No newline at end of file