You are mis-understanding the plans, Microsoft will end 'sales' of OneCare on June 30th, 2009. They will continue support of the program until your subscription runs out, so in your case that would be late 2009 or whatever the exact ending date a 1 year renewal would provide.
If you're attempting to use multiple antivirus programs installed together at the same time, this will create problems since almost all installed antivirus require complete and solitary access to portions of the PC, otherwise a conflict will occur. In some cases, different anti-spyware programs can co-exist togetherr as long as the real-time components aren't enabled at the same time, though this is even becoming less common. In general, it's best to remove any other security software when installing a new security suite on your PC, especially if the new program notifies you of any potential conflict with a specific existing program.
Actually, OneCare has been on par for at least a year with most of the major antivirus applications on the market today. However, it doesn't attempt to include the out of date detections required to acheive the highest 'numbers' on some of the home brew tests, since these are simply 'garbage collections' of old [Windows 9x/ME or even DOS] malware often no longer found 'in the wild'. In fact, several of these tests have changed significantly over the last year in an attempt to catch up to the realities of protecting the Windows 2000 or newer systems that are the most prevelant today.
If you think that large numbers of people who believe certain things about antimalware can't be wrong, remember, they also voted Bush into office, twice.
OneCareBear
