It is possible to install the integration plugins for VMware on an ESX host directly from the Nimble website, provided your hosts have internet access:
esxcli software vib install -d http://update.nimblestorage.com/esx5/ncm
If you have the Exchange Management Tools installed, you can easily import the Exchange module into a standard Powershell by running the Add-PSSnapin cmdlet.
Depending on the Exchange version, the module to add is slightly different:
If you're not sure about the version, you can also use wildcard characters:
If you don't want to install the management tools, you can also use PS remoting to remotely access the management shell from a standard Powershell.