Remvoe & Create OWA Exchange Back End

1. Remove OWA  (Exchange Back End).
Remove-OwaVirtualDirectory -Identity "ex1\owa (Exchange Back End)"

[PS] C:\Windows\system32>Remove-OwaVirtualDirectory -Identity "ex1\owa (Exchange Back End)"

Confirm
Are you sure you want to perform this action?
Outlook Web App virtual directory "ex1\owa (Exchange Back End)" is being removed.
[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [?] Help (default is "Y"): y
[PS] C:\Windows\system32>

2. Create OWA  (Exchange Back End).
New-OwaVirtualDirectory -WebSiteName "Exchange Back End" -Server ex1

[PS] C:\Windows\system32>New-OwaVirtualDirectory -WebSiteName "Exchange Back End" -Server ex1
Name                                    Server                                  OwaVersion
----                                    ------                                  ----------
owa (Exchange Back End)                 EX1                                     Exchange2013
[PS] C:\Windows\system32>