Explore the key capabilities, technologies and user interfaces of the Microsoft® Lync™ Server 2010 platform running in a virtual lab. It's simple: no complex setup or installation is required. You get a downloadable manual and a 90-minute block of time for each module. You can sign up for additional 90-minute blocks any time.

Time to time, I see situations, when Exchange unable to send some emails to some organizations. In most cases, there is not a problem on Exchange level. Very often, it's is DNS issues. If you check your logs, you can find there some evens with similar content:

The DNS server encountered an invalid domain name in a packet from 216.113.128.62. The packet will be rejected. The event data contains the DNS packet.

Here is a solution that works for me :). Source

Useful tools for assisting with the planning and deployment of Exchange Server 2010.

• Exchange Pre-Deployment Analyzer
• Mailbox Server Role Storage Requirements Calculator and usage notes
• Exchange Server Profile Analyzer (x86 and x64)
• Jetstress 2010
• Load Generator 2010
• Baretail (free version)
• Log Parser
• Exchange Log Analyzer
• Exchange 2010 PerfWiz
• EMTShooter

Hear from members of Microsoft IT's Technology Office, who are involved with the day to day enterprise architecture planning and integration with MS products. This is involved with collaborating across MSIT to ensure all products/technology align within IT's infrastructure...

Microsoft has just released a new hotfix to address an issue with slow logon performance when you use AppData folder redirection.

Consider the following scenario in a network environment:

• You configure users to use roaming profiles to log on to a client computer that is running Windows 7 or Windows Server 2008 R2.
• You redirect the %AppData%\Roaming folder to a network share.
• You enable the Do not automatically make redirected folders available offline Group Policy setting on the client computer.
• You enable both of the following Group Policy settings for the %AppData%\Roaming folder:
• Administratively assigned offline files
• Turn on economical application of administratively assigned Offline Files

This configuration specifies that only new files or folders in the %AppData%\Roaming folder are synchronized during the logon process.

In this scenario, the users encounter slow logon behavior on the client computer.

In addition to this hotfix you will also need to make some registry changes which of course you can easily deploy this using the Group Policy Preferences Registry Extension.

Link http://support.microsoft.com/kb/981830

This video provides of an overview of the steps required when migrating from Office Communications Server 2007 R2 to Lync Server 2010.