diff --git a/SlackAPI/RPCMessages/ChannelListResponse.cs b/SlackAPI/RPCMessages/ChannelListResponse.cs
deleted file mode 100644
index 22280c1..0000000
--- a/SlackAPI/RPCMessages/ChannelListResponse.cs
+++ /dev/null
@@ -1,10 +0,0 @@
-using System;
-
-namespace SlackAPI
-{
-    [RequestPath("channels.list")]
-    public class ChannelListResponse : Response
-    {
-        public Channel[] channels;
-    }
-}
diff --git a/SlackAPI/RPCMessages/GroupArchiveResponse.cs b/SlackAPI/RPCMessages/GroupArchiveResponse.cs
deleted file mode 100644
index d043012..0000000
--- a/SlackAPI/RPCMessages/GroupArchiveResponse.cs
+++ /dev/null
@@ -1,13 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SlackAPI
-{
-    [RequestPath("groups.archive")]
-    public class GroupArchiveResponse : Response
-    {
-    }
-}
diff --git a/SlackAPI/RPCMessages/GroupCloseResponse.cs b/SlackAPI/RPCMessages/GroupCloseResponse.cs
deleted file mode 100644
index d0fdcd2..0000000
--- a/SlackAPI/RPCMessages/GroupCloseResponse.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SlackAPI
-{
-    [RequestPath("groups.close")]
-    public class GroupCloseResponse : Response
-    {
-        public string no_op;
-        public string already_closed;
-    }
-}
diff --git a/SlackAPI/RPCMessages/GroupCreateChildResponse.cs b/SlackAPI/RPCMessages/GroupCreateChildResponse.cs
deleted file mode 100644
index 51d495e..0000000
--- a/SlackAPI/RPCMessages/GroupCreateChildResponse.cs
+++ /dev/null
@@ -1,13 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SlackAPI
-{
-    [RequestPath("groups.createChild")]
-    public class GroupCreateChildResponse : GroupResponse
-    {
-    }
-}
diff --git a/SlackAPI/RPCMessages/GroupKickResponse.cs b/SlackAPI/RPCMessages/GroupKickResponse.cs
deleted file mode 100644
index 3213fb2..0000000
--- a/SlackAPI/RPCMessages/GroupKickResponse.cs
+++ /dev/null
@@ -1,13 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SlackAPI
-{
-    [RequestPath("groups.kick")]
-    public class GroupKickResponse : Response
-    {
-    }
-}
diff --git a/SlackAPI/RPCMessages/GroupLeaveResponse.cs b/SlackAPI/RPCMessages/GroupLeaveResponse.cs
deleted file mode 100644
index 9c96122..0000000
--- a/SlackAPI/RPCMessages/GroupLeaveResponse.cs
+++ /dev/null
@@ -1,13 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SlackAPI
-{
-    [RequestPath("groups.leave")]
-    public class GroupLeaveResponse : Response
-    {
-    }
-}
diff --git a/SlackAPI/RPCMessages/GroupListResponse.cs b/SlackAPI/RPCMessages/GroupListResponse.cs
deleted file mode 100644
index d8ad777..0000000
--- a/SlackAPI/RPCMessages/GroupListResponse.cs
+++ /dev/null
@@ -1,14 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SlackAPI
-{
-    [RequestPath("groups.list")]
-    public class GroupListResponse : Response
-    {
-        public Channel[] groups;
-    }
-}
diff --git a/SlackAPI/RPCMessages/GroupMessageHistory.cs b/SlackAPI/RPCMessages/GroupMessageHistory.cs
deleted file mode 100644
index 5708ca8..0000000
--- a/SlackAPI/RPCMessages/GroupMessageHistory.cs
+++ /dev/null
@@ -1,9 +0,0 @@
-using System;
-
-namespace SlackAPI
-{
-    [RequestPath("groups.history")]
-    public class GroupMessageHistory : MessageHistory
-    {
-    }
-}
diff --git a/SlackAPI/RPCMessages/GroupRenameResponse.cs b/SlackAPI/RPCMessages/GroupRenameResponse.cs
deleted file mode 100644
index 6590576..0000000
--- a/SlackAPI/RPCMessages/GroupRenameResponse.cs
+++ /dev/null
@@ -1,14 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SlackAPI
-{
-    [RequestPath("groups.rename")]
-    public class GroupRenameResponse : Response
-    {
-        public Channel channel; 
-    }
-}
diff --git a/SlackAPI/RPCMessages/GroupSetPurposeResponse.cs b/SlackAPI/RPCMessages/GroupSetPurposeResponse.cs
deleted file mode 100644
index 93a061c..0000000
--- a/SlackAPI/RPCMessages/GroupSetPurposeResponse.cs
+++ /dev/null
@@ -1,14 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SlackAPI
-{
-    [RequestPath("groups.setPurpose")]
-    public class GroupSetPurposeResponse : Response
-    {
-        public string purpose;
-    }
-}
diff --git a/SlackAPI/RPCMessages/GroupSetTopicResponse.cs b/SlackAPI/RPCMessages/GroupSetTopicResponse.cs
deleted file mode 100644
index f8adab9..0000000
--- a/SlackAPI/RPCMessages/GroupSetTopicResponse.cs
+++ /dev/null
@@ -1,14 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SlackAPI
-{
-    [RequestPath("groups.setTopic")]
-    public class GroupSetTopicResponse : Response
-    {
-        public string topic;
-    }
-}
diff --git a/SlackAPI/RPCMessages/GroupUnarchiveResponse.cs b/SlackAPI/RPCMessages/GroupUnarchiveResponse.cs
deleted file mode 100644
index d68061c..0000000
--- a/SlackAPI/RPCMessages/GroupUnarchiveResponse.cs
+++ /dev/null
@@ -1,13 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace SlackAPI
-{
-    [RequestPath("groups.unarchive")]
-    public class GroupUnarchiveResponse : Response
-    {
-    }
-}
diff --git a/SlackAPI/RPCMessages/MessageHistory.cs b/SlackAPI/RPCMessages/MessageHistory.cs
index 8fb797a..f760d78 100644
--- a/SlackAPI/RPCMessages/MessageHistory.cs
+++ b/SlackAPI/RPCMessages/MessageHistory.cs
@@ -3,8 +3,7 @@
 
 namespace SlackAPI
 {
-    [RequestPath("im.history")]
-    public class MessageHistory : Response
+    public abstract class MessageHistory : Response
     {
         /// <summary>
         /// I believe this is where the read cursor is?  IE: How far the user has read.
diff --git a/SlackAPI/SlackClient.cs b/SlackAPI/SlackClient.cs
index e81a55c..b8b72df 100644
--- a/SlackAPI/SlackClient.cs
+++ b/SlackAPI/SlackClient.cs
@@ -170,16 +170,7 @@ public void GetConversationsMembers(Action<ConversationsMembersResponse> callbac
             APIRequestWithToken(callback, parameters.ToArray());
         }
 
-        public void GetChannelList(Action<ChannelListResponse> callback, bool ExcludeArchived = true)
-        {
-            APIRequestWithToken(callback, new Tuple<string, string>("exclude_archived", ExcludeArchived ? "1" : "0"));
-        }
-
-        public void GetGroupsList(Action<GroupListResponse> callback, bool ExcludeArchived = true)
-        {
-            APIRequestWithToken(callback, new Tuple<string, string>("exclude_archived", ExcludeArchived ? "1" : "0"));
-        }
-
+        [Obsolete("Use conversations API")]
         public void GetDirectMessageList(Action<DirectMessageConversationListResponse> callback)
         {
             APIRequestWithToken(callback);
@@ -260,11 +251,6 @@ public void GetDirectMessageHistory(Action<MessageHistory> callback, DirectMessa
             GetHistory(callback, conversationInfo.id, latest, oldest, count, unreads);
         }
 
-        public void GetGroupHistory(Action<GroupMessageHistory> callback, Channel groupInfo, DateTime? latest = null, DateTime? oldest = null, int? count = null, bool? unreads = false)
-        {
-            GetHistory(callback, groupInfo.id, latest, oldest, count, unreads);
-        }
-
         public void GetConversationsHistory(Action<ConversationsMessageHistory> callback, Channel conversationInfo, DateTime? latest = null, DateTime? oldest = null, int? count = null, bool? unreads = false)
         {
             GetHistory(callback, conversationInfo.id, latest, oldest, count, unreads);
@@ -293,26 +279,14 @@ public void GetFileInfo(Action<FileInfoResponse> callback, string fileId, int? p
             APIRequestWithToken(callback, parameters.ToArray());
         }
         #region Groups
-        public void GroupsArchive(Action<GroupArchiveResponse> callback, string channelId)
-        {
-            APIRequestWithToken(callback, new Tuple<string, string>("channel", channelId));
-        }
-
-        public void GroupsClose(Action<GroupCloseResponse> callback, string channelId)
-        {
-            APIRequestWithToken(callback, new Tuple<string, string>("channel", channelId));
-        }
 
+        [Obsolete("Use conversations API")]
         public void GroupsCreate(Action<GroupCreateResponse> callback, string name)
         {
             APIRequestWithToken(callback, new Tuple<string, string>("name", name));
         }
 
-        public void GroupsCreateChild(Action<GroupCreateChildResponse> callback, string channelId)
-        {
-            APIRequestWithToken(callback, new Tuple<string, string>("channel", channelId));
-        }
-
+        [Obsolete("Use conversations API")]
         public void GroupsInvite(Action<GroupInviteResponse> callback, string userId, string channelId)
         {
             List<Tuple<string, string>> parameters = new List<Tuple<string, string>>();
@@ -323,66 +297,18 @@ public void GroupsInvite(Action<GroupInviteResponse> callback, string userId, st
             APIRequestWithToken(callback, parameters.ToArray());
         }
 
-        public void GroupsKick(Action<GroupKickResponse> callback, string userId, string channelId)
-        {
-            List<Tuple<string, string>> parameters = new List<Tuple<string, string>>();
-
-            parameters.Add(new Tuple<string, string>("channel", channelId));
-            parameters.Add(new Tuple<string, string>("user", userId));
-
-            APIRequestWithToken(callback, parameters.ToArray());
-        }
-
-        public void GroupsLeave(Action<GroupLeaveResponse> callback, string channelId)
-        {
-            APIRequestWithToken(callback, new Tuple<string, string>("channel", channelId));
-        }
-
+        [Obsolete("Use conversations API")]
         public void GroupsMark(Action<GroupMarkResponse> callback, string channelId, DateTime ts)
         {
             APIRequestWithToken(callback, new Tuple<string, string>("channel", channelId), new Tuple<string, string>("ts", ts.ToProperTimeStamp()));
         }
 
+        [Obsolete("Use conversations API")]
         public void GroupsOpen(Action<GroupOpenResponse> callback, string channelId)
         {
             APIRequestWithToken(callback, new Tuple<string, string>("channel", channelId));
         }
 
-        public void GroupsRename(Action<GroupRenameResponse> callback, string channelId, string name)
-        {
-            List<Tuple<string, string>> parameters = new List<Tuple<string, string>>();
-
-            parameters.Add(new Tuple<string, string>("channel", channelId));
-            parameters.Add(new Tuple<string, string>("name", name));
-
-            APIRequestWithToken(callback, parameters.ToArray());
-        }
-
-        public void GroupsSetPurpose(Action<GroupSetPurposeResponse> callback, string channelId, string purpose)
-        {
-            List<Tuple<string, string>> parameters = new List<Tuple<string, string>>();
-
-            parameters.Add(new Tuple<string, string>("channel", channelId));
-            parameters.Add(new Tuple<string, string>("purpose", purpose));
-
-            APIRequestWithToken(callback, parameters.ToArray());
-        }
-
-        public void GroupsSetTopic(Action<GroupSetPurposeResponse> callback, string channelId, string topic)
-        {
-            List<Tuple<string, string>> parameters = new List<Tuple<string, string>>();
-
-            parameters.Add(new Tuple<string, string>("channel", channelId));
-            parameters.Add(new Tuple<string, string>("topic", topic));
-
-            APIRequestWithToken(callback, parameters.ToArray());
-        }
-
-        public void GroupsUnarchive(Action<GroupUnarchiveResponse> callback, string channelId)
-        {
-            APIRequestWithToken(callback, new Tuple<string, string>("channel", channelId));
-        }
-
         #endregion
 
         #region Conversations
diff --git a/SlackAPI/SlackTaskClient.cs b/SlackAPI/SlackTaskClient.cs
index fd65669..1b7b305 100644
--- a/SlackAPI/SlackTaskClient.cs
+++ b/SlackAPI/SlackTaskClient.cs
@@ -124,10 +124,12 @@ public Task<UserEmailLookupResponse> GetUserByEmailAsync(string email)
             return APIRequestWithTokenAsync<UserEmailLookupResponse>(new Tuple<string, string>("email", email));
         }
 
+        [Obsolete("Use conversations API")]
         public Task<ChannelCreateResponse> ChannelsCreateAsync(string name) {
             return APIRequestWithTokenAsync<ChannelCreateResponse>(new Tuple<string, string>("name", name));
         }
 
+        [Obsolete("Use conversations API")]
         public Task<ChannelInviteResponse> ChannelsInviteAsync(string userId, string channelId)
         {
             List<Tuple<string, string>> parameters = new List<Tuple<string, string>>();
@@ -168,16 +170,6 @@ public Task<ConversationsMembersResponse> GetConversationsMembersAsync(string ch
             return APIRequestWithTokenAsync<ConversationsMembersResponse>(parameters.ToArray());
         }
 
-        public Task<ChannelListResponse> GetChannelListAsync(bool ExcludeArchived = true)
-        {
-            return APIRequestWithTokenAsync<ChannelListResponse>(new Tuple<string, string>("exclude_archived", ExcludeArchived ? "1" : "0"));
-        }
-
-        public Task<GroupListResponse> GetGroupsListAsync(bool ExcludeArchived = true)
-        {
-            return APIRequestWithTokenAsync<GroupListResponse>(new Tuple<string, string>("exclude_archived", ExcludeArchived ? "1" : "0"));
-        }
-
         public Task<DirectMessageConversationListResponse> GetDirectMessageListAsync()
         {
             return APIRequestWithTokenAsync<DirectMessageConversationListResponse>();
@@ -255,11 +247,6 @@ public Task<MessageHistory> GetDirectMessageHistoryAsync(DirectMessageConversati
             return GetHistoryAsync<MessageHistory>(conversationInfo.id, latest, oldest, count, unreads);
         }
 
-        public Task<GroupMessageHistory> GetGroupHistoryAsync(Channel groupInfo, DateTime? latest = null, DateTime? oldest = null, int? count = null, bool? unreads = false)
-        {
-            return GetHistoryAsync<GroupMessageHistory>(groupInfo.id, latest, oldest, count, unreads);
-        }
-
         public Task<ConversationsMessageHistory> GetConversationsHistoryAsync(Channel conversationInfo, DateTime? latest = null, DateTime? oldest = null, int? count = null, bool? unreads = false)
         {
             return GetHistoryAsync<ConversationsMessageHistory>(conversationInfo.id, latest, oldest, count, unreads);
@@ -287,26 +274,12 @@ public Task<FileInfoResponse> GetFileInfoAsync(string fileId, int? page = null,
             return APIRequestWithTokenAsync<FileInfoResponse>(parameters.ToArray());
         }
         #region Groups
-        public Task<GroupArchiveResponse> GroupsArchiveAsync(string channelId)
-        {
-            return APIRequestWithTokenAsync<GroupArchiveResponse>(new Tuple<string, string>("channel", channelId));
-        }
-
-        public Task<GroupCloseResponse> GroupsCloseAsync(string channelId)
-        {
-            return APIRequestWithTokenAsync<GroupCloseResponse>(new Tuple<string, string>("channel", channelId));
-        }
 
         public Task<GroupCreateResponse> GroupsCreateAsync(string name)
         {
             return APIRequestWithTokenAsync<GroupCreateResponse>(new Tuple<string, string>("name", name));
         }
 
-        public Task<GroupCreateChildResponse> GroupsCreateChildAsync(string channelId)
-        {
-            return APIRequestWithTokenAsync<GroupCreateChildResponse>(new Tuple<string, string>("channel", channelId));
-        }
-
         public Task<GroupInviteResponse> GroupsInviteAsync(string userId, string channelId)
         {
             List<Tuple<string, string>> parameters = new List<Tuple<string, string>>();
@@ -317,66 +290,17 @@ public Task<GroupInviteResponse> GroupsInviteAsync(string userId, string channel
             return APIRequestWithTokenAsync<GroupInviteResponse>(parameters.ToArray());
         }
 
-        public Task<GroupKickResponse> GroupsKickAsync(string userId, string channelId)
-        {
-            List<Tuple<string, string>> parameters = new List<Tuple<string, string>>();
-
-            parameters.Add(new Tuple<string, string>("channel", channelId));
-            parameters.Add(new Tuple<string, string>("user", userId));
-
-            return APIRequestWithTokenAsync<GroupKickResponse>(parameters.ToArray());
-        }
-
-        public Task<GroupLeaveResponse> GroupsLeaveAsync(string channelId)
-        {
-            return APIRequestWithTokenAsync<GroupLeaveResponse>(new Tuple<string, string>("channel", channelId));
-        }
-
         public Task<GroupMarkResponse> GroupsMarkAsync(string channelId, DateTime ts)
         {
             return APIRequestWithTokenAsync<GroupMarkResponse>(new Tuple<string, string>("channel", channelId), new Tuple<string, string>("ts", ts.ToProperTimeStamp()));
         }
 
+        [Obsolete]
         public Task<GroupOpenResponse> GroupsOpenAsync(string channelId)
         {
             return APIRequestWithTokenAsync<GroupOpenResponse>(new Tuple<string, string>("channel", channelId));
         }
 
-        public Task<GroupRenameResponse> GroupsRenameAsync(string channelId, string name)
-        {
-            List<Tuple<string, string>> parameters = new List<Tuple<string, string>>();
-
-            parameters.Add(new Tuple<string, string>("channel", channelId));
-            parameters.Add(new Tuple<string, string>("name", name));
-
-            return APIRequestWithTokenAsync<GroupRenameResponse>(parameters.ToArray());
-        }
-
-        public Task<GroupSetPurposeResponse> GroupsSetPurposeAsync(string channelId, string purpose)
-        {
-            List<Tuple<string, string>> parameters = new List<Tuple<string, string>>();
-
-            parameters.Add(new Tuple<string, string>("channel", channelId));
-            parameters.Add(new Tuple<string, string>("purpose", purpose));
-
-            return APIRequestWithTokenAsync<GroupSetPurposeResponse>(parameters.ToArray());
-        }
-
-        public Task<GroupSetTopicResponse> GroupsSetTopicAsync(string channelId, string topic)
-        {
-            List<Tuple<string, string>> parameters = new List<Tuple<string, string>>();
-
-            parameters.Add(new Tuple<string, string>("channel", channelId));
-            parameters.Add(new Tuple<string, string>("topic", topic));
-
-            return APIRequestWithTokenAsync<GroupSetTopicResponse>(parameters.ToArray());
-        }
-
-        public Task<GroupUnarchiveResponse> GroupsUnarchiveAsync(string channelId)
-        {
-            return APIRequestWithTokenAsync<GroupUnarchiveResponse>(new Tuple<string, string>("channel", channelId));
-        }
-
         #endregion
 
         #region Conversations