Exchange 2007 SP1 has shipped today, there is a TON of stuff you need to be aware of before you roll out. This is a significant upgrade that should not just be clicked through without reading the manual. So while congratulations are in order and feature set gold enough to make you go for it right now, hold on, wait a minute..
The set of release notes linked in with the download link points to the RTM (ie, the original release of Exchange 2007, not SP1). The actual Exchange 2007 SP1 Release Notes are here.
I’ll break down the SP1 over the next couple of days so stay tuned. If you need to rush and install it today, please read the documentation first.
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