Description of Update Rollup 4 for Exchange Server 2007 Service Pack 3
It looks like Exchange 2007 SP3 RU4 has a lot of goodies in it. At least 5 of the items in this list are impacting the environment at my day job.
While it’s good to see progress, I’m always wary of these updates because of the regression bugs they often introduce. Test and patch carefully, gang.
It’s brutally important that you understand this article if you support Exchange 2007 or 2010.
Read it. Now.
One item you’ve probably learned by now if you’re an Exchange admin working on a 2007 deployment is that Microsoft has changed the behavior of the recipient update policy.  Most of you won’t care about this and that’s just fine.  You shouldn’t.  I would dare say that if your Exchange environment is engineered well and planned out the way Microsoft probably expects it to be, you should have almost no issues whatsoever.
The delegates and the manager must all use Outlook 2007 when you use delegates in Outlook 2007.
Important post out there for you sysadmins dealing with Exchange and delegation scenarios.
I was one of the engineers on the call documented here from last weekend. This was the Friday night from hell.
I won’t rehash the technical details of what happened. If you want to know the tech piece of it, head to the link. There’s no need to restate it – besides, it would bring back memories that might cause me to draw my own blood and scrawl nasty proverbs on the wall.