Exchange 2010 SP3 Roll-up 4 Has Been Released

MS released Exchange 2010 SP3 RU4 last week on December 11.
It's basically a Security Update in the form of a Roll-up.

Download here and of course the normal order of install is the same:

1. CAS (with internet-facing first)
2. Hub Transport and Edge Servers
3. Mailbox servers
4. Unified Messaging servers
**Note** The installer auto-restarts the Exchange services, so a server reboot isn't required but I always reboot to make sure no services die and things come back smoothly.

Go to my previous post for a how-to on patching your Exchange environment.