I have about 50 websites that daily update Google Merchant with product feeds. I've read over the emails Google has sent over the last month saying the update will require this and that but at first glance I thought I was covered. All my feeds have quantity on-hand listed so when the emails said they'd require availability I thought I was covered. Today I got an email from a client saying his feed was down and the reason was because the feed didn't have "availability" with one of Google's 4 acceptable responses (in stock, out of stock, backordered, preorder). I thought WTF already. If we list an item showing 0 on hand then Google should know the item is out of stock. If we show a quantity 1 or greater than Google should show the item in stock. Doesn't work that way. You now have to have a distinct field labeled availability and have one of the 4 variables displayed or Google is taking down your entire feed. Just a heads up for those that thought by showing quantity you covered the availability requirement. Maybe I was the only stupid one but I noticed a bunch of my competitors are now gone from Google Shopping so I figure I might have a jump of them until they fix their scripts. Check your feeds and make sure you're not disabled. You have to actually look at the products themselves to detect. Just looking in the feed section will show your number of items and show they updated but won't show they're disabled from Google Shopping. Actually look at an item and make sure you have the now required availability field. Google just killed all our feeds yesterday so make sure you keep an eye on them.