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I gave OLSM a try a year or so ago, but I never became a user, so I may be off on this, but I don't think there is an easy way to migrate your website from OLSM. I've read a little about this on various forums, and the majority of the comments seems to suggest that you can't just "copy and paste" an existing OLSM web site if you want to move it. As one person put it, "the HTML code is full of propreitary calls and link-backs" so you might be in a situation where it is just as easy to build a new site from scratch. On the upside, you can take what you've learned since creating your original site and make your new site a step forward for users. Good luck with taking care of this, you don't have a lot of time to play around with.