Meanwhile, most business users will be slow to adopt anything that could disrupt an established workflow. But the changes also hit hard for developers and customers in vertical markets. eWEEK Labs tests show that Vista is ready to come out fighting. Click here to read more."My major fear in any version upgrade is unexpected interruption of function," reader Robert Geller observed. As a physician, he is concerned about support for legacy devices and software. And then theres the patient."All too often, products have seemed to work in a new environment at first glance. Only later is the discovery made that some feature of the old product doesnt work anymore, after the damage is already in process. In high-priority environments like health care, such interruptions are unacceptable. So, changes to new versions are deferred until extensive end-user experience has occurred," Geller said. However, for some readers Vista is just too much trouble, especially in business. The ROI in the upgrade is difficult for some customers to see at this time. For example, heres what one IT manager at a "small telecom company" said about the Vista transition: "My business is keeping this business operating. We are not in business to provide a continuing revenue stream to Microsoft or any other vendor. I have better and more important things to do than to be constantly updating and changing software for no reason other than its the latest and greatest smoke and mirrors from Redmond. Our basic philosophy is: If it isnt broke, dont fix it," the IT manager said. "I have just completed upgrading our small office from Win95/Win98 to WinXP, solely because The Boss wanted to be able to play videos and connect to an MP3 service. Windows XP buys us nothing that is important to our basic business, and was, to my mind, a waste of time and money. We definitely are not going to move to Vista or Longhorn or whatever idiotic name Bill Gates comes up with next," he concluded. What does Microsoft owe its customers in the area of compatibility? Click here to read more. Well, for some Windows 95 is still good enough. But for most, Windows XP is good enough, thank you very much. Instead of the new and shiny OS, many readers said that they wanted a "better XP." Perhaps Microsoft would have better luck at rollout time by pitching Vista as "Service Pack 3." It could happen. What do you think? Will Vista climb to the top of the charts right off, or will it take some time to find a following? And how long? Let us know here. Check out eWEEK.coms for the latest news in desktop and notebook computing.