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.
