On 2010, nothing
In 2007 when I go to the roles under Server Configuration only the 2007 servers are listed. So 2010 is currently running Client Access & Mailbox, but only the 2007 box shows up in 2007. In 2010 only the 2010 box shows up.
I've had a hunt but so far the only way I've seen to apply the update is from the installation routine when setting up Exchange 2010?
If you want reassurance, mine was done on a live system (in the knowledge I had decent backups just in case!) and it went fine - no issues at all. I wouldn't hesitate to do it again.
Just to update my thread a bit - if anyone is wondering why I haven't done a final write up or summary, it is because I haven't actually finished! 2010 and 2003 co-exist perfectly with no issues at all. I have had several users running on 2010 for a couple of months and ironed out some of the minor issues + been testing hyper-v backups (as my E2010 installation is on Hyper-V).
I hope to complete soon!
Doing our transition next week, these are the guides i've been given to read through before commencing:
Install Exchange 2010 in an Existing Exchange 2003 Organization: Exchange 2010 Help
Screencast: How to Install Exchange Server 2010 on Windows Server 2008 R2
Upgrade Exchange 2003 to Exchange 2010
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