Fixing Leading and Trailing Whitespace in Exchange Objects
You must remove all the leading and trailing spaces from Exchange 2000/2003 user names, group names, and Public Folder names prior to migrating them to Exchange 2007 or Exchange 2010. Previous versions of Exchange and Outlook would let you create these
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Read the complete post at http://www.expta.com/2010/03/fixing-leading-and-trailing-whitespace.html