For CIOs who've listened to years of hype about Microsoft Vista,\u00a0a potentially aggravating new phase\u00a0begins tomorrow -- the onslaught of comments and questions from your colleagues and acquaintances\u00a0who load the new OS on home PCs.Microsoft released the enterprise version of Vista in November, 2006, but most people will try it at home first. As predicted, enterprises are taking their time with this upgrade, for reasons including Vista\u2019s hardware requirements, significant interface changes, and a hard-won belief that with any Microsoft OS, it\u2019s wise to wait at least until the first service pack. (See CIO's complete Vista coverage for more details, plus the latest news and analysis.)But the consumer versions of Vista hit store shelves tomorrow, January 30, so brace yourselves. From now on, when one of your users buys a new home PC, chances are, it will be running Vista. (Unless, he or she has\u00a0joined the Apple camp.) Here\u2019s the lowdown on some hot-button issues you'll hear about:1.\u00a0Vista Looks Really DifferentCosmetically, Vista represents the biggest Windows change people have seen in quite some time. We\u2019re talking Joan Rivers facelift here, not just a little new lipstick. For example, basic landmarks like the Start menu have changed. Also, you can now\u00a0alternate between screens using a new feature called Windows Flip 3D. Hit Alt-Tab and this new option shows thumbnails of each Window you have open in a 3D stack for your perousal.\u00a02. I Upgraded My PC, and It\u2019s Not Running FasterFor people who want to add Vista to their current PCs, Microsoft offers a downloadable tool that tests if, and how well, a PC can run Vista. Many people will need to at least add memory to get peppy performance. For the consumer versions, Microsoft recommends at least 512MB of memory, an 800-MHz processor and a graphics card with DirectX 9 support. But Dell advises that if you want to use Vista\u2019s new Aero interface, which can be turned on or off, you should really plan on 2GB of memory.\u00a0That's one reason Vista's prettiest looks won't show up on enterprise desktops this spring.\u00a03. This Puppy\u2019s Got Some \u201cIssues\u201dVista may not play nicely with existing anti-virus and security programs, and some other elderly apps will cause trouble, for example, due to device driver incompatibilities. Via Slashdot, early Vista users are reporting hitches related to CD and DVD burning. And Microsoft has already issued an email asking for suggestions for Vista\u2019s first service pack, querying pre-release users participating in Microsoft\u2019s Technology Adoption Program (TAP), my IDG News service colleague Jeremy Kirk reported last week. Microsoft hasn\u2019t given a firm date for that service pack.4. I Don\u2019t Know My BitLocker from My ReadyBoostMicrosoft has thrown a lot of new jargon at Windows users with this release, plus the usual array of versions, both of which will confuse people. Is your favorite free-tech-suppport mooch going to know what \u201cReadyBoost\u201d is? Nope. Not to be confused with an energy drink, ReadyBoost is Microsoft\u2019s new scheme that lets you \u201cborrow\u201d extra memory from a USB flash drive to improve your PC performance. And \u201cBitLocker\u201d, the Vista encryption technology that laptop users will want in case they leave their laptops at the airport, is included in the ultimate and enterprise Vista versions, but not the less expensive ones. 5. My Neighbor Scored a Bootleg Copy on the NetToo bad it\u2019s malware in disguise and about to turn his PC into Spam-zilla. As my IDG news service colleague Robert MacMillan reported last week, about 50 percent of the \u201cfree!\u201d\u00a0 Vista downloads popping up on the Net are \u2013 surprise \u2013 malicious Trojan horse programs. Lucky new owners of supposedly \u201cpirated\u201d or \u201ccracked\u201d versions of Vista\u00a0will get key-logging and spyware programs, among others.After the dust clears, check back here in a few days: Let us know whether your users are gushing or griping about Vista.