Hi guys Exchange 2007 SP1 RU9 at the moment. I'm about to upgrade to SP2, and wanted to slipstream RU4 into this, but I'm not "certain" this is possible. Can anyone point me somewhere to confirm if it can be done. If it cannot, I "might" consider going direct to SP3 though I'm on a large production environment so a bit wary of going to such a new SP so soon. As always your thoughts are greatly appreciated. Tom

Can't do it for a SP update, only a fresh install. From link: http://technet.microsoft.com/en-us/library/ee221147(EXCHG.80).aspx "Exchange 2007 does not support the slipstream installation of an update rollup during the installation of a service pack. The Exchange installation folder includes an Updates folder. When you perform a new Exchange installation, you can copy an update rollup to the Updates folder. In this scenario, the update rollup package is applied during the installation of Exchange. The Updates folder supports a new installation of Exchange. The folder is not supported for use during a service pack installation. Therefore, you cannot include (slipstream) an update rollup together with the installation of a service pack. The slipstream installation of an update rollup during a service pack installing has not been tested. Therefore, you may experience unintended results. The following example scenarios show the supported use of the Updates folder."Tim Harrington - Catapult Systems - http://HowDoUC.blogspot.com

Thanks Tim, I read a very similar post prior to adding this question, perhaps even the same one, and you've confirmed what I thought (and probably should have gathered when I read the post anyway). Thanks, Tom