I think that the chat history has always been in the xml format, but for some reason it no longer reads it in the normal MSN format; instead it just displays the xml code as if I'm editing web code. When I refresh the page it shows it on normal text but still not in the MSN format, being just one huge unreadable paragraph.
Messenger Plus! chat logging logs in either txt or html, not xml. Event logs can be stored in xml, but I dont think you are on about those as you said chat.
Are you on about the chat logging feature of Messenger itself?
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