Hi Robert,
If you're referring to the Live ID used on the
http://office.microsoft.com (Office Online) pages use the 'Sign out' on the top right
of the page close your browser, restart and go back to Office Online and log in with a different Windows Live ID.
If you're referring to the Office Live websites you may want to check with the folks through
http://officelivecommunity.com
or formal support through the 'Professional support' choice at:
http://office.microsoft.com/en-us/officelive/FX101954801033.aspx
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I would like to change the windows live id associated with my office online account.>>
--
Bob Buckland ?

MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*