Error: Missing Expression After Unary Operator '!'

Relevant Products: Exclaimer Cloud - Signatures for Office 365

You are installing the Signatures for Exchange feature and you get the following error message:

Reason

As part of the install script, an alias is created which is named as !exist - this is used throughout the script when searching for folder paths.

This error indicates that the version of Windows PowerShell currently running is not able to create this alias.

Resolution

To resolve this issue:

-  install PowerShell version 4.0 

To check your current PowerShell session version, enter (in the Windows PowerShell):

If the current PowerShell version installed is below version 4.0 then install the Windows Management Framework 4.0