Recently I was installing SharePoint 2013 Cumulative Update August 2015 when I encounter below error couple time.
"The installation of this package failed"
The best workaround for this issue is to simply run the installation package 3 times. The package will fail to install with the above error on the first two attempts, but should be successful on the third attempt. The installation will not be corrupt and there are no other known issues once you have the update package successfully installed.
Original Source: http://blogs.msdn.com/b/tehnoonr/archive/2015/08/28/sharepoint-2013-august-2015-cumulative-update-package-fails-to-install.aspx
Recently I was working on sending mail using smtp server where I stuck on below error: IIS/SMTP - emails are stuck in mailroot/Queue ...
you will see this error when you try to add SharePoint Hosted app : Sorry, apps are turned off. If you know who runs the server, tell them...