Cumulative Updates are a complete
package of the software itself, so when you using it to
update your server,
you are actually reinstalling Exchange Server 2013 with
all the updates bundled into one package. You can use this CU1 for a new
installation as well. Exchange Server 2013 now adheres
to a scheduled delivery model. In this model, cumulative
updates are released every three months. Cumulative
Update package will be released as a full refresh of the
Exchange product and will be installed as a build to
build upgrade.
Follow the below steps to upgrade
Exchange Server 2013 to Exchange Server 2013 CU1
Note : Make sure you take a complete backup for your
exchange servers before applying updates.
-
Download Cumulative Update 1 for
Exchange Server 2013 from :
http://www.microsoft.com/en-us/download/details.aspx?id=38176

Double click on the file you downloaded, named Exchange-x64, to extract setup files.

-
Choose/Browse a directory to extract setup files and
then click OK

-
Once extraction is completed, open the directory
where you have extracted setup files, then double
click on setup.exe

-
On the Check for Updates page , select
Connect to the internet and check for updates
and click Next
You can have setup download Exchange Server 2013
updates from the internet before you install
Exchange. If no updates are found, click Next to
continue
If you don't have access to the internet or don't
want to check for updates, you can select
Don't check for updates right now and then
click Next


-
Copying and preparing the necessary resources for
setup will start

-
Setup will detect that you already have Exchange
Server 2013 installed, and will inform you that you
are about to upgrade your server. Click Next

-
On the License Agreement page, accept the terms and
click Next

-
On the Readiness Checks page, setup will check if your organization
and the computer you're running Exchange on are ready
for Exchange 2013 CU1. It'll report any failures as
errors. You'll need to fix any reported errors
before you can install Exchange 2013 CUI, for
example a pending reboot from a previous Windows
Update needed to be fixed before proceeding.

Once the prerequisites analysis reaches 100%, click
install

During the upgrade process, be informed that
services will be stopped and then started again
after installation is completed. So during this
period, Exchange server will not be available to
your users. If this is the only Exchange Server,
then inform your users that exchange will be down.

below you can find different setup steps:
The last step is finalizing setup. Few seconds later
setup will be completed.

Once setup is completed, you can open Exchange Admin
Center by selecting the checkbox Launch
Exchange Administration Center after finishing
Exchange setup and then click finish

That's it, you have successfully upgraded Exchange
Server 2013 to Exchange Server 2013 CU1
Summary
With Microsoft Exchange Server 2013,
hotfixes and service packs are not delivered anymore.
Instead of the priority-driven hotfix release and rollup
update model used by previous versions of Microsoft
Exchange, Exchange Server 2013 now adheres to a
scheduled delivery model. In this model, cumulative
updates are released every three months.
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