Itay has blogged the exact steps and screenshots on how to display current user info (email, full name, manager, etc) in InfoPath form by calling UserProfileService.asmx in MOSS 2007, most importantly without writing any code! http://blogs.microsoft.co.il/blogs/itaysk/archive/2007/04/05/InfoPath-_2D00_-Get-the-current-user-without-writing-code.aspx
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