TIBCO iProcess Technology Plugin 11.9 is compatible with TIBCO Enterprise Message Service (EMS) 10.2.1, and TIBCO is willing to support it.

However, it's essential to emphasize that formal testing by TIBCO hasn't been carried out to verify this compatibility.

In light of considering an upgrade to EMS 10.2.1, we strongly urge thorough testing within your lower environment.  This step is essential to identify and address any potential compatibility issues one may face.
 

Note: EMS 10.2.1 will not be officially certified with iProcess 11.9 until the next release is out.