problem with Widows live mail

I have been drafting an email over a few days and have saved it and then returned to it a number of times with no problems. I now get a message - "a problem occurred while trying to open this message. A problem has occurred. Please try again"  I have tried several times and still get the same message. Is there any way to open the message?  it wont even let me look at the message properties. What is the likely cause for this message? Or am I going to have to retype the whole thing again, which will be really annoying

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