If we are not talking about large user base, you could export the directory
from 5.5 to a csv file. Edit and import into Active Directory. See:
Step-by-Step Guide to Bulk Import and Export to Active Directory
http://www.microsoft.com/windows2000/techinfo/planning/activedirectory/bulks
teps.asp
How to Use Csvde.exe to Import Contacts into Active Directory
http://support.microsoft.com/default.aspx?scid=KB;EN-US;q300409&
There are a few third party utilities that will synch directory information
as well.
More info is required to really answer your question I think.
William
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