This is tricky, because there are a ton of questions with only the [tag:vmware] tag -- **1,090** as of the time I originally wrote this.

Note the sidebar where it says "related tags", pay close attention to this Related Tags sidebar:

- vmware-esx × 146 
- virtualization × 144 
- vmware-esxi × 111 
- linux × 74 
- networking × 63 
- windows × 59 

As for the idea of "rename the tag if the text contains x", I **downloaded a copy of the server fault database and ran some queries**:

- questions with only the [tag:vmware] tag, and no other [tag:vmware-] related tags: **725**
- of the above, with the string "esx" or "esxi" in the body or title: **157**

That leaves **~568 questions (!)** needing manual retagging. That's .. a lot. Really a lot.

edit: I have done the following, just now

- when a question was tagged [tag:vmware] only, and its body or title contained "esxi", I converted that tag to [tag:vmware-esxi] (70 questions)

- when a question was tagged [tag:vmware] only, and its body or title contained "esx", I converted that tag to [tag:vmware-esx] (92 questions)

Beyond that am I at a loss as how to proceed..