After upgrade Sametime Standard to 8.5.2 Notes Basic Client cannot log in

After upgrading Sametime Server to 8.5.1 users using Notes 8.x Basic and older Notes clients cannot log in

In the [Config] section of the sametime.ini section add ST_MINIMAL_CLIENT_VERSION=6510 (or lower) to resolve this issue.

Note that all servers in the environment must have the same values for both VP_SECURITY_LEVEL and ST_MINIMAL_CLIENT_VERSION to communicate with each other.