I think that if the Exchange team could provide more information on when SP1 will be officially released, then less of us would be tempted to apply the beta. I have been tempted, but after talking to some resources at Microsoft, am not going to go there. But I need to let my users know when we can migrate those who need certain features in SP1 to move to Exchange 2007.
It's very frustrating to be so "in the dark" here. The ambiguity in our published roadmap to Exchange 2007 causes conflict with senior management, who would like to see a clear timeline which we're confident in. On one hand I want to say, we'll be migrated by X date, but with the history of delayed releases, such as with Server 2008 today, I hesitate to put my neck on the line again. Since Server 2008 was pushed back, will SP1 as well. The 2 release dates seemed tied together in some news I've seen.