Effective on the [U.S.-formatted] dates listed below, IBM will withdraw support from the following product releases licensed under the IBM International Program License Agreement:

5724-E70  6.5.[x]         4/30/09     IBM Lotus Notes and Domino
55724-E89  6.5.[x]        4/30/09     IBM Lotus Enterprise Integrator


This means that 6.5.6 is the last maintenance release for the 6.5 codestream.  Mainstream technical support for Notes/Domino 6.5.x (as well as LEI 6.5.x) will end on April 30, 2009.  Support extensions are available for up to two years following that date (through April, 2011). The Notes/Domino 6.x codestream first shipped in September, 2002.


Original IBM Announcement (PDF File)



Regarding the following technote IBM seamed to push the end of service for 6.5.x to 2010.

End of Service (EOS) of Lotus Enterprise Integrator, Notes, and Domino 6.5.x