Hopefully many Second Life Marketplace merchants have received an email like this :
We have finished upgrading the listings in your store to work with the Viewer-Managed Marketplace feature. You must use a Viewer that supports VMM (http://wiki.secondlife.com/wiki/Release_Notes/Second_Life_Release/184.108.40.2063583), and will need to restart the viewer if you had it open during the migration. Your stores should now be fully functional.
If you would like more information on the upgrades and how to manage your Marketplace inventory items from here on, please see the Knowledge Base Article on the Viewer-Managed Marketplace https://community.secondlife.com/t5/English-Knowledge-Base/Viewer-managed-Marketplace-Beta/ta-p/2854226.
Thank you for using the Second Life Marketplace
That should indicate that everything has gone smoothly with your migration to the new Viewer Managed Marketplace, then you’ll just need to get your head around how everything works with the Viewer Managed Marketplace, but fear not, Linden Lab have provided plenty of helpful assistance there. A really good place to start is with the comprehensive knowledge-base article linked in the email.
I haven’t seen too many complaints about the migration, some people have reported that they’ve received an email stating there was a problem with the migration and that Linden Lab are investigating. In those circumstances you will still need to manage your Marketplace listings as you usually would.