diff --git a/seahub/api2/utils.py b/seahub/api2/utils.py
index c070e442b6..67bc472851 100644
--- a/seahub/api2/utils.py
+++ b/seahub/api2/utils.py
@@ -130,14 +130,25 @@ def get_groups(email):
         group_json.append(group)
     return group_json, replynum
 
+def get_msg_group_id(msg_id):
+    try:
+        msg = GroupMessage.objects.get(id=msg_id)
+    except GroupMessage.DoesNotExist:
+        return None
+
+    return msg.group_id
+
 def get_group_and_contacts(email):
     group_json = []
     contacts_json = []
+    replies_json = []
+    gmsgnums = {}
+    umsgnums = {}
+    replies = {}
     gmsgnum = umsgnum = replynum = 0
 
     contacts = [c.contact_email for c in Contact.objects.filter(user_email=email)]
     joined_groups = get_personal_groups_by_user(email)
-    gmsgnums = umsgnums = {}
 
     notes = UserNotification.objects.get_user_notifications(email, seen=False)
     for n in notes:
@@ -148,12 +159,25 @@ def get_group_and_contacts(email):
                 continue
             gmsgnums[gid] = gmsgnums.get(gid, 0) + 1
         elif n.is_grpmsg_reply():
+            d = n.grpmsg_reply_detail_to_dict()
+            msg_id = d['msg_id']
+            if replies.get(msg_id, None):
+                replies[msg_id] = replies[msg_id] + 1
+            else:
+                replies[msg_id] = 1
+                d['mtime'] = n.timestamp
+                d['name'] = email2nickname(d['reply_from'])
+                d['group_id'] = get_msg_group_id(msg_id)
+                replies_json.append(d)
             replynum = replynum + 1
         elif n.is_user_message():
             if n.detail not in contacts:
                 contacts.append(n.detail)
             umsgnums[n.detail] = umsgnums.get(n.detail, 0) + 1
 
+    for r in replies_json:
+        r['msgnum'] = replies[r['msg_id']]
+
     for g in joined_groups:
         msg = GroupMessage.objects.filter(group_id=g.id).order_by('-timestamp')[:1]
         mtime = 0
@@ -186,7 +210,7 @@ def get_group_and_contacts(email):
         umsgnum = umsgnum + umsgnums.get(contact, 0)
         contacts_json.append(c)
     contacts_json.sort(key=lambda x: x["mtime"], reverse=True)
-    return contacts_json, umsgnum, group_json, replynum, gmsgnum
+    return contacts_json, umsgnum, group_json, gmsgnum, replies_json, replynum
 
 def prepare_events(event_groups):
     for g in event_groups:
@@ -259,12 +283,17 @@ def get_group_msgs(groupid, page, username):
 
     return group_msgs
 
+def get_timetamp(msgtimestamp):
+    timestamp = int(time.mktime(msgtimestamp.timetuple()))
+    return timestamp
+
 def group_msg_to_json(msg, get_all_replies):
     ret = {
         'from_email' : msg.from_email,
         'nickname' : email2nickname(msg.from_email),
-        'time' : msg.timestamp,
+        'timestamp' : get_timetamp(msg.timestamp),
         'msg' : msg.message,
+        'msgid' : msg.id,
         }
 
     try:
@@ -291,8 +320,10 @@ def group_msg_to_json(msg, get_all_replies):
     for reply in msg.replies:
         r = {
             'from_email' : reply.from_email,
-            'time' : reply.timestamp,
+            'nickname' : email2nickname(reply.from_email),
+            'timestamp' : get_timetamp(reply.timestamp),
             'msg' : reply.message,
+            'msgid' : reply.id,
             }
         replies.append(r)
 
@@ -309,7 +340,7 @@ def get_group_msgs_json(groupid, page, username):
     try:
         group_msgs = paginator.page(page)
     except (EmptyPage, InvalidPage):
-        return None
+        return None, -1
 
     if group_msgs.has_next():
         next_page = group_msgs.next_page_number()
@@ -317,7 +348,7 @@ def get_group_msgs_json(groupid, page, username):
         next_page = -1
 
     group_msgs.object_list = list(group_msgs.object_list)
-    msgs = [ group_msg_to_json(msg, False) for msg in group_msgs.object_list ]
+    msgs = [ group_msg_to_json(msg, True) for msg in group_msgs.object_list ]
     return msgs, next_page
 
 def get_group_message_json(group_id, msg_id, get_all_replies):
@@ -339,7 +370,7 @@ def get_person_msgs(to_email, page, username):
     try:
         person_msgs = paginator.page(page)
     except (EmptyPage, InvalidPage):
-        person_msgs = paginator.page(paginator.num_pages)
+        return None
 
     # Force evaluate queryset to fix some database error for mysql.
     person_msgs.object_list = list(person_msgs.object_list)
diff --git a/seahub/api2/views.py b/seahub/api2/views.py
index e3cb6375c2..7e90bd7bf4 100644
--- a/seahub/api2/views.py
+++ b/seahub/api2/views.py
@@ -31,7 +31,7 @@ from serializers import AuthTokenSerializer, AccountSerializer
 from utils import is_repo_writable, is_repo_accessible, calculate_repo_info, \
     api_error, get_file_size, prepare_starred_files, \
     get_groups, get_group_and_contacts, prepare_events, \
-    get_person_msgs, api_group_check, get_email, \
+    get_person_msgs, api_group_check, get_email, get_timetamp, \
     get_group_message_json, get_group_msgs, get_group_msgs_json
 from seahub.base.accounts import User
 from seahub.base.models import FileDiscuss, UserStarredFiles, \
@@ -252,6 +252,7 @@ class AccountInfo(APIView):
         email = request.user.username
         info['email'] = email
         info['total'] = get_user_quota(email)
+        info['nickname'] = email2nickname(email)
 
         if CALC_SHARE_USAGE:
             my_usage = get_user_quota_usage(email)
@@ -1995,10 +1996,11 @@ class GroupAndContacts(APIView):
     throttle_classes = (UserRateThrottle, )
 
     def get(self, request, format=None):
-        contacts, umsgnum, group_json, replynum, gmsgnum = get_group_and_contacts(request.user.username)
+        contacts, umsgnum, group_json, gmsgnum, replies, replynum = get_group_and_contacts(request.user.username)
         res = {
             "groups": group_json,
             "contacts": contacts,
+            "newreplies":replies,
             "replynum": replynum,
             "umsgnum" : umsgnum,
             "gmsgnum" : gmsgnum,
@@ -2088,7 +2090,8 @@ class GroupMsgsView(APIView):
         username = request.user.username
         page = get_page_index (request, 1)
         msgs, next_page  = get_group_msgs_json(group.id, page, username)
-
+        if not msgs:
+            msgs = []
         # remove user notifications
         UserNotification.objects.seen_group_msg_notices(username, group.id)
         ret = {
@@ -2137,6 +2140,8 @@ class GroupMsgView(APIView):
         msg = get_group_message_json(group.id, msg_id, True)
         if not msg:
             return api_error(status.HTTP_404_NOT_FOUND, 'Messageg not found.')
+
+        UserNotification.objects.seen_group_msg_reply_notice(request.user.username, msg_id)
         return Response(msg)
 
     @api_group_check
@@ -2177,6 +2182,12 @@ class UserMsgsView(APIView):
         page = get_page_index(request, 1)
 
         person_msgs = get_person_msgs(to_email, page, username)
+        if not person_msgs:
+            Response({
+                    'to_email' : to_email,
+                    'next_page' : next_page,
+                    'msgs' : [],})
+
         next_page = -1
         if person_msgs.has_next():
             next_page = person_msgs.next_page_number()
@@ -2191,10 +2202,11 @@ class UserMsgsView(APIView):
                         })
             m = {
                 'from_email' : msg.from_email,
-                'nick' : email2nickname(msg.from_email),
-                'time' : msg.timestamp,
+                'nickname' : email2nickname(msg.from_email),
+                'timestamp' : get_timetamp(msg.timestamp),
                 'msg' : msg.message,
                 'attachments' : atts,
+                'msgid' : msg.message_id,
                 }
             msgs.append(m)
 
@@ -2229,7 +2241,7 @@ class NewRepliesView(APIView):
         grpmsg_reply_list = [ n.grpmsg_reply_detail_to_dict().get('msg_id') for n in notes if n.msg_type == 'grpmsg_reply']
         group_msgs = []
         for msg_id in grpmsg_reply_list:
-            msg = get_group_message_json (None, msg_id, False)
+            msg = get_group_message_json (None, msg_id, True)
             if msg:
                 group_msgs.append(msg)
 
diff --git a/seahub/notifications/models.py b/seahub/notifications/models.py
index 78752bfa66..daaef323f6 100644
--- a/seahub/notifications/models.py
+++ b/seahub/notifications/models.py
@@ -196,7 +196,7 @@ class UserNotificationManager(models.Manager):
             qs = qs.filter(seen=seen)
         return qs
 
-    def seen_group_msg_reply_notice(self, to_user):
+    def seen_group_msg_reply_notice(self, to_user, msg_id=None):
         """Mark all group message replies of a user as seen.
         
         Arguments:
@@ -204,9 +204,19 @@ class UserNotificationManager(models.Manager):
         - `to_user`:
         - `msg_id`:
         """
-        super(UserNotificationManager, self).filter(
-            to_user=to_user, msg_type=MSG_TYPE_GRPMSG_REPLY,
-            seen=False).update(seen=True)
+        if not msg_id:
+            super(UserNotificationManager, self).filter(
+                to_user=to_user, msg_type=MSG_TYPE_GRPMSG_REPLY,
+                seen=False).update(seen=True)
+        else:
+            notifs = super(UserNotificationManager, self).filter(
+                to_user=to_user, msg_type=MSG_TYPE_GRPMSG_REPLY,
+                seen=False)
+            for n in notifs:
+                d = n.grpmsg_reply_detail_to_dict()
+                if msg_id == d['msg_id']:
+                    n.seen = True
+                    n.save()
 
     def remove_group_msg_reply_notice(self, to_user):
         """Mark all group message replies of a user as seen.