Rename Exchange Organization Name

In short: you can't. It may be possible, but its highly recommended against (especially by MS). Give this link a read for details:

http://www.eicorp.net/exchangefaq/noframesfaq.html#3.1.Q.3

I found that it could be done by using Move Server Wizard. Any one did it?

The mover server will do just that. It is pretty painless in a single server environment. Make sure to backup before running, and copy off important Public Folders to a pst. The mover server wizard has "lost" replica's of public folders, which a simple copy back from a pst works well. Make sure to download the latest version from the MS web site. Go to www.microsoft.com/exchange and go to the downloads area to get the SP4 version. It is part of the support tools.

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