Create accounts on your email server? Follow its instructions.
Create Outlook mail profiles for individual users? Microsoft uses text files with a .prf extension and a highly structured format to provide information to OUtlook that enables Outlook to create or modify a mail profile. You can create such .prf files with the Custom Installation Wizard or Custom Maintenance Wizard tools in the Office Resource Kit. For more details, including a variety of .prf deployment methods, read the excellent white paper "Configuring Outlook Profiles by Using a PRF File" at http://office.microsoft.com/search/redir.aspx?assetid=HA011403051033&QueryID=pHm7c_60I&respos=3