A few hours ago, Microsoft (finally) released Cumulative Update 1 (CU1) for Exchange 2013 RTM. Many of us have been waiting for this update as it was the last prerequisite standing in the way of upgrading to Exchange 2013 when you already had Exchange running prior.

I’m pretty sure that over the course of the next few weeks, we will be seeing lots of interesting new information coming out. For now, we’ll have to settle with Microsoft’s promise to publish the release notes + updated documentation anytime soon. As Bharat Suneja already mentioned, it’s scheduled to be release on the 3rd of April:


Where to get it?

First things, first. The newer bits are available from the following link:


Yes, you’re not dreaming. It’s 1.3GB. How is that possible? Simple. Cumulative Updates are quite different from Update Rollups. They are entire new builds of the product that don’t require a prior version to be installed. Hence the size. For more information on this new “update strategy”, have a look here.

What’s new?

The CU is “huge”. And I don’t mean that literally (although it’s literally huge as well). Next to a lot of fixes (that should’ve made it in RTM to be honest), will definitely make your life running Exchange 2013 a lot easier.

Next to that, there are some things that have changed and have been added. To name a few: