After running my mailbox on Exchange 2007 for several weeks with no problem,a fter migrating the rest of the company over (about 20 mailboxes), most, if not all, people started getting popup messages from Microsoft Office Outlook: "Unable to add to the server Junk E-mail Lists, you are over the size allowed on the server. The Junk E-mail Filter on the server will be disabled until your Junk E-mail Lists have been reduced to the size allowed on the server." We are running Outlook 2003 on Windows XP Pro SP2 and never had this when all of the mailboxes were on Exchange 2000. I have not enabled Safe List aggregation or any other Exchange spam feature (at least that I was aware of)on the exchange server and I cannot find any documentation about blocked lists on the server. We have TrendMicro ScanMail for Microsoft Exchange 8 running on the Exchange 2007 server (we also had TrendMicro antivirus & spam products on the Exchange 2000 server).
I have tried a number of things that were suggested by answeres to other similar questions on EE & other forums, but the only thing that worked (for my mailbox) was if I deleted all of teh blocked serder addresses in my Outlook (no big deal) AND unchecked "Also trust e-mail from my Contacts" - which IS a big deal, since if I have that unchecked, Outlook puts a lot of important real mail into junk - including plain text messages from people I know that is entirely safe & has nothing in it to indicate that it would be spam.
How do I administer the server junk email list this message refers to, since I cannot find anything about it in any Exchange 2007 documentation that I have searched?
I also tried creating and increasing several times the registry key suggested in Question ID:22553848 (which was for Exchange 2003, but I tried anyway)