Microsoft Exchange 2010 Service Pack 2 has been available since December 2011, but isn’t deployed via Windows Update or WSUS, so there is a good chance you may not have installed it yet.
Download the Service Pack from here.
Once downloaded extract the service pack.
Run the setup from the location you extracted the service pack to.
From the menu select “Install Microsoft Exchange Server upgrade”, once you have read the details in the ‘Plan’ section.
Read the introduction and click next.
Accept the license agreement and click next.
On the next page wait for the readiness check to complete. If you have the SBS Console open you will see the following errors.
With the SBS Console closed, the Readiness Check should be all green, as below.
Click the Upgrade button to continue.
Once the installation has finished you have the option of taking a look at the log file. Click Finish
Once the installation has completed check all the relevant Exchange services are started.
Don’t forget to install the latest rollup as well, which at the time of writing is rollup 3 available here.
The walk through for installing rollup 3 is in the following post, here.