Active Directory enforces an maxRageValue on multi-valued attributes.
I found an RFC draft that descibes the option.
most ldapsearch utilities will allow the use using a similar command TO:
This will allow the return of the member attribute values upto the limit of the range.
When I use Studio and enter "member;Range=0-* as an attribute value, the value is seprated at the "=" which is substituted with a ",".