I'd like to get access to the Password Settings Container (PSC) for our domain (running on 2 Server 2008 RS STDs), which serves our Exchange 2010 service. In order to do this, I have to raise the domain functional level to 2008 R2. My question is whether there's any danger to our Exchange service? Thanks in advance!

It's supported: http://technet.microsoft.com/en-us/library/ff728623.aspx Exchange Server Supportability Matrix