Thanks michaelkroes! Interesting! I see <version>1.5.1</version> there. So it’s obviously not the latest version of the contacts plugin.
How would I go about upgrading that? I thought that Mail-in-a-Box handles all the ownCloud plugins as well.
Just before I started this thread, I ran through the upgrade steps to make sure I was on the latest version of everything. Then, as now, it said
Installing ownCloud (contacts/calendar)... ownCloud is already latest version
And <version>1.5.1</version> is still in the info.xml. 