Automatically remove style attributes on paste

FCKConfig.AutoDetectPasteFromWord = true ;

Also have a look at all the other settings on this page: http://docs.fckeditor.net/FCKeditor_2.x/Developers_Guide/Configuration/Configuration_Options

FCKConfig.ForcePasteAsPlainText = true ; ?

We remove the Word stuff programmatically using WordCleaner that we found somewhere on the web. It is for c# and works really well, but like I said, only on the server side, ie. after postback.
If this is something you would like to look into, then I will see if I can find the link.

Hi
I cannot find it, but here is the code. I cannot give the person credit because I don't know who it is. Also, I made small changes that should speed it up a bit.
I removed our stuff from it, so it might not build, just check namespaces/braces etc.

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Collections.Specialized;
using System.Text.RegularExpressions;
using System.Collections;
namespace YOURNAMESPACE
{
    public static class WordCleaner
    {
        public static void Clean(string filename)
        {
            if (string.IsNullOrEmpty(filename))
            {
                throw new ArgumentNullException("No filename provided.");
            }

            string filepath = filename;
            if (Path.GetFileName(filepath) == filename)
            {
                filepath = @"C:\temp\convertdocs\";//Path.Combine(Environment.CurrentDirectory, filepath);
            }

            if (!File.Exists(filename))
            {
                throw new FileNotFoundException("File doesn't exist.");
            }

            string html = File.ReadAllText(filepath);
            Console.WriteLine("input html is " + html.Length + " chars");
            html = CleanWordHtml(html);
            html = FixEntities(html);
            filepath = Path.GetFileNameWithoutExtension(filepath) + ".modified.htm";
            File.WriteAllText(filepath, html);
            Console.WriteLine("cleaned html is " + html.Length + " chars");
        }

        public static string CleanWordHtml(string html)
        {
            StringCollection sc = new StringCollection();
            // get rid of unnecessary tag spans (comments and title)
            sc.Add(@"<!--(\w|\W)+?-->");
            sc.Add(@"<title>(\w|\W)+?</title>");
            // Get rid of classes and styles
            sc.Add(@"\s?class=\w+");
            sc.Add(@"\s+style='[^']+'");
            // Get rid of unnecessary tags
            sc.Add(
            @"<(meta|link|/?o:|/?style|/?div|/?st\d|/?head|/?html|body|/?body|/?span|!\[)[^>]*?>");
            // Get rid of empty paragraph tags
            sc.Add(@"(<[^>]+>)+&nbsp;(</\w+>)+");
            // remove bizarre v: element attached to <img> tag
            sc.Add(@"\s+v:\w+=""[^""]+""");
            // remove extra lines
            sc.Add(@"(\n\r){2,}");
            foreach (string s in sc)
            {
                html = Regex.Replace(html, s, "", RegexOptions.IgnoreCase);
            }
            return FixEntities(html);
        }

        public static string FixEntities(string html)
        {
            Hashtable nvc = new Hashtable();
            nvc.Add("“", "&ldquo;");
            nvc.Add("”", "&rdquo;");
            nvc.Add("–", "&mdash;");
            foreach (string key in nvc.Keys)
            {
                html = html.Replace(key, nvc[key].ToString());
            }
            return html;
        }

    }
}

Then you use it

string cleanCode = WordCleaner.CleanWordHtml(Request["myEditor"] as string);

The extra method for cleaning out files is there as well...not sure if that still works since we don't use it any more.