Try adding the setting PageSize="1000" to your query parameters. For example:
<ActiveDirectoryQuery><Directives WhereToBind="LDAP://CN=Users, DC=test, DC=com" Filter="(objectCategory=user)" SearchScope="onelevel" PropertiesToReturn="cn" PageSize="1000"/></ActiveDirectoryQuery>
By default Active Directory only allows for a single page of 1000 results. By explicitly setting this value multiple pages (and hence all results) are returned.
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Yes. ActiveADAPTER is available as a Windows Communication Foundation (WCF) service. So with or without BizTalk Server, you can query and update Active Directory with ActiveADAPTER

ActiveADAPTER WCF exposes essentially the same functionality as our Active Directory Send and Receive Adapters.
ActiveADAPTER WCF services can be consumed by BizTalk Server, but BizTalk Server is not required.
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