How to convert Microsoft Publisher format(.pub) to other format(e.g:doc.odt)

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I have using mircosoft Publisher format to design my flyer and certificate but i am not using microsoft publisher anymore.I try search at internet but i dont find any software that can convert or view the pub format.I have find zamzar.com website and it can convert but it convert the image and run a lot when open with micrsoft words.Any can help me?Thanks first.