I recevied an email stating my Lightroom trial has expired. I didn't have a trial. I have purchased Lightroom 6. Now when I open it, it has a message that indicates: "Lightroom Mobile Trial is expired". I am not using Mobile.
Ignore this e-mail and this message. The message and e-mail refer to your free trial of Lightroom Mobile. It does not refer to your license to use Lightroom 6 .
I assume the message on my Lightroom will eventually go away?
I don't know, but you can certainly ignore it.
Or you can turn it off by disabling the sync to Lightroom mobile. There is a drop down menu from the Nameplate that you can use to do this.