I wanted to take a moment to get out the latest information concerning Exchange Anti-Spam Filters for the different Exchange products that have been released. This definitely will not answer all the questions but it should help in clarifying things that you may notice changing over the next couple of weeks as we begin publishing Anti-spam Filter updates for Exchange Server 2010 product targeting the Standard CAL configuration.

Exchange Server 2003 Anti-spam Filter Updates

I previously discussed Demystifying Exchange Server 2003 SP2 IMF Updates in detail many moons ago. The IMF Updates for Exchange Server 2003 will only published on the third Wednesday of the month moving forward. Previously, it was being offered twice a month on the first and second Wednesday of the month.

Exchange Server 2007 Anti-spam Filter Updates

In preparation of releasing Anti-Spam updates for Exchange Server 2010 in the very near future, I would like to take a moment to remind that Enabling Forefront Security Anti-spam Updates is a good article to read for understanding how to enable Anti-Spam updates. There are other articles on the internet and this is the one that caught my attention. We should have updates to the instructions in the near future if it hasn't been done already to reflect how to configure Exchange Server 2010.

I would like to point out that for Exchange Server 2007, the publishing of Anti-Spam updates for the Standard CAL will still be once every two weeks and the Enterprise CAL updates will still be offered daily.

Exchange Server 2010 Anti-spam Filter Updates

For Exchange Server 2010, the Standard CAL spam definition updates will become available over the next couple of days and will be published twice a month from that point on. Exchange Server 2010 Enterprise CAL anti-spam definition updates will not be provided by Microsoft Update. They will be made available via Forefront Security for Exchange.

Exchange Server 2007

Exchange Server 2010

Update Type

Standard

Enterprise

Standard

Enterprise

Filter definitions

Bi-weekly

Daily

Bi-weekly

Via Forefront

Spam signatures

n/a

multiple/day

n/a

Via Forefront

IP Reputation

n/a

multiple/day

n/a

Via Forefront

** WSUS Administrators **

For the WSUS administrators, you may notice the previous Product Classification "Exchange Server 2007 Anti-spam" is now "Exchange Server 2007 and Above Anti-spam". Over the next few weeks, you will see this name change again once more to "Microsoft Exchange Standard Anti-spam Updates" once the change is allowed to go live. We also published the first Exchange Server 2010 category and you should be seeing that listed with the other Product Classifications. These changes were done to make the above possible.

Thanks,

- Scott Roberts (Exchange)