If you are receiving an error on Step 1 when deploying Lync:
Upload C:\Program Files\Microsoft Lync Server 2010\Deployment\Setup\BackCompatSchema.ldf fails. The exit code is "8224".
Here are a few things to try/verify:
1. Make sure your DCs are running
2. Make sure your computer is joined to the domain
3. Make sure your account is part of the Enterprise Admins and Schema Admins groups.
4. Right click, Run as other user, and type in your credentials to the account you have added yourself to the groups above.
Right click, running the Configuration Wizard seemed to solve the problem for me. Not sure why it doesn't work just logged in as the user, but what the hey, the installer ran successfully and extended the schema.