Try
LDAP filter: samaccountname=%u
Left side is the attribute to match; %u is replaced with username. The above would be for Active Directory. If the legacy Exchange LDAP service provides no single unique attribute to search for, then you'd lose, but I'd be surprised.
LDAP search base is specified from most to least specific, something like:
LDAP search base: o=corporate,p=mydom,c=US
Is the a=(BLANK) above a typo or an html scrubbing artifact? It's invalid.
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