I'm trying to find a set of instructions for upgrading Vmware (ESXi and Vsphere) from 5.1 to 5.5, but all I'm finding online is a bunch of separate, incomplete knowledgebase articles which is making it difficult to get an overview of what's involved. What I'd like is a single, concise document that lists the steps involved. It could be a free online article, someone's blog, a small booklet, someone here who takes the trouble to write it out. Does such a thing exist? If so, can you provide the reference or even provide the text here. I'm running a very small, simple environment consisting of two ESXi hosts and Vsphere Standard edition. Thanks.