Net Express Websync 3 will include ADAM and automatically install it when Websync 3 is installed. ADAM is a Windows component, and is always installed into the ADAM directory under the system root (usually C:\Windows).
If, after installing Websync 3, you do not have ADAM installed, check for the ADAM directory, or look for "Active Directory Application Mode" in your list of installed software in the Add / Remove Programs control panel.
You need to have ADAM installed to complete the rest of this setup process, even if you will be using AD, because the setup uses some utilities from ADAM. If you are using AD, and not using ADAM, you can skip the final step in this section, "Creating the ADAM Application Partition".
Some people may want to initially configure ES to use ADAM while they get acquainted with the LDAP support in ESF, even if they eventually intend to use AD, as ADAM is simpler to administer and use.