Supported notes client was not found

Hello all,
When we run the MNE prerequisites checker , we get this error message "Supported Notes Client was not found"
The Notes client is in English and in the registry we see that it is a singleuser client.
In prerequisites checker logs it sees only "Supported notes client was not found", nothing more.
Clinet detalis :
IBM Notes 9 Social Edition
Release 9.0.1
Revision 20131022.1138 (Release 9.0.1)
Standard Configuration
Thanks in advance