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0.81 is ancient. I think the first order of business is to get everyone up to version 1.0.4 (if not the 1.1 alpha, which despite its alpha status is quite stable). Once you've installed it as administrator, go to the Troubleshooting Guide on the SpamBayes > Help menu and look for the section titled "SpamBayes is not available for all users on the machine." That should get you started.

Given the filtering oddities, I'd consider having users retrain from scratch. It doesn't take long and may result in better filtering. You may also need to educate your users: the sender's address is a small part of what SpamBayes looks at when scoring messages. If a message appears to come from a trusted source but otherwise looks like spam, it'll probably be treated as spam. (And this is a good thing, since it's not hard to spoof a sender.)

Almost all of my users are using Spambayes Outlook Addin Binary 0.81 in Outlook 2002 running on Dell Inspirons with Windows XP Professional operating systems. Many of our users have started complaining that legitimate emails are being delivered to the Junk Suspect folder. When they "Recover from Spam" the email is placed back into the Inbox but the next time an email comes in from that user it goes back into the Junk Suspect folder. It appears Spambayes is not correctly retaining the training on these legitimate emails when the user "Recovers from Spam".

Another issue that I think may be related is the creation of additional junk email folders. Several users have started noticing multiple junk email folders in Outlook (i.e. junk email, junk email2, spam, spamtrap). They are not manually creating these additional folders and many users are telling me they just saw the additional folder pop up one day. Any ideas on why Spambayes would be creating additional folders in Outlook?

Another issue is related to installing the 1.0.4 version with Outlook. Most all of our users have had their computers upgraded from Windows 2000 Professional to Windows XP Professional operating systems when they received new Dell computers. On these new computers I started trying to upgrade Spambayes from Spambayes Outlook Addin Binary version 0.81 to Spambayes 1.0.4. I have gone to the website and downloaded the Spambayes 1.0.4 install package. When I set up the new computer I am logged in as an administrator. I install the Spambayes 1.0.4 and everything works fine. I then log into Outlook with the administrator account (my personal profile that has administrative rights). Spambayes begins its initial setup for that administrator account and everything functions normally. Everything looks as if it will work fine for the user's profile. However, when I set up the new user account on the computer and I log into Outlook using the user's profile for the first time there is no Spambayes. There is nothing that shows Spambayes was loaded onto the computer. The only way I have been able to resolve this problem is to log back in as administrator and uninstalling Spambayes 1.0.4. I then install the older version of Spambayes (Spambayes Outlook Addin Binary 0.81) that has worked in the past using the Spambayes Outlook Setup 0081.exe file. This allows me to then log in as the user and set up Spambayes which then functions. This is ok but it means that our machines do not have the updated version of Spambayes loaded.

Is this an issue with version 1.0.4? Should I be using the 1.0.4 version with Outlook? Do I need to continue using the 0.81 addin with Outlook? Is using this older version possibly causing the training problems with legitimate emails? Could any or all of the above issues be related? If they are not related could someone address the possible causes and solutions for the particular issues?