Microsoft Office Communicator: error message with ID 504 means “you think the other party is on-line, but it is off-line”
Posted by jpluimers on 2013/01/17
Every once in a while, Office Communicator indicates a contact is not off-line and allows me to send messages to him/her, but then gives an error 504.
The reason is that the off-line status replicates slowly, so you were not aware your contact went off-line while typing the message.
The Error ID 504 is just an unfrienly way of saying “your contact went off-line, but you didn’t know that when sending the message, and I don’t have a friendly way of telling you this”.
–jeroen
via: Communicator 2007 R2 Help on Error ID 504.
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