Lync & OCS Migration Top 10

Here are my Top 10 quick frequently-needed facts when you are first considering a Lync 2010 migration from OCS 2007 R2 (or if you are considering co-existence).
1. Lync 2010 Servers Can Coexist with OCS 2007 R2 Servers (in an OCS 2007 R2 Deployment)
• They can coexist in the same AD Forest and AD Domain, but [...]