your in owa and you try to im within owa to a client and that works fine but the client tries to reply and gets a error 504 message


ensure you have applied the latest patches for OCS 2007 R2

and the following patch

now once you have done that locate the following 3 dll’s


and ensure they have the sames versions and size as in the patch!

now once you got this done… locate and copy the dll’s to the c:\program files\microsoft\exchange server\v14\bin

dont forget to rename the old ones…

restart the World Wide Web Publishing Service and voila! all is working

hope it helps!