Does their side say "Message sent successfully to xxx" X being your computer name? It could be they aren't doing something write. Go to cmd prompt and type "net send (computer name) "Text of message" then hit enter. Example:
Right click on My Computer - manage-action-alltasks-send console message in message box type something in add box type computer name both: Yours(loop - self test) and some other computer .Then click send, You will see who is not connected to a network and probably why.
Go to computer management- services ;find Messanger right click open properties and check all settings and dependencies.Also check settings for RPC and Workstation services.
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