We are seeing a few calls from people that have upgraded to Antigen for Exchange SP2.

These calls have AntigenService.exe hanging. This can create issues updating, connecting with the client and mail flow issues.

This issue is caused when we initialize the cloud mark engine.

There is a hot fix rollup for SP2 at http://support.microsoft.com/kb/975355 that addresses this issue. The current KB does not have this issue listed but we are working on changing this.