Unable to perform an action on Outlook and seeing “The action cannot be completed” error message instead? With this annoying error line, the complete error message also says the unavailability of connection to Microsoft Exchange and indicates that you’re not online or your device isn’t connected to the internet. It means there is something wrong with the internet and network settings of your device. You may also meet this trouble while setting up your Microsoft Exchange account with Outlook. Don’t worry, if you’re also getting this message on Outlook, try the following solutions to overcome this problem.
http://offiiceoffice.com/blog/how-to-troubleshoot-the-action-cannot-be-completed-issue-in-outlook/