Here are some helpful guides on how to install my ‘favorite’ mail client, IBM Lotus Notes on Citrix Presentation Server.  There are very few differences between the installation methods for Lotus Notes versions 6 through 8, but just for completeness I have included links to all of them.  The official Citrix article is quite good and includes screen shots of not only the Lotus Notes installation but also the publishing of Lotus Notes.

Lotus Notes Version 7
http://support.citrix.com/article/CTX112963

Lotus Notes Versions 6 and 7
http://www-01.ibm.com/support/docview.wss?rs=0&uid=swg21202109

Lotus Notes Version 8
http://www-01.ibm.com/support/docview.wss?rs=463&uid=swg21265898