I need to import a list of contacts in a csv that contains more than just firstname, lastname & externalemailaddress.  What about their job description, phone number, address, etc.  Has anyone done this before?

Review the documentation for the following cmdlets so you're aware of which ones you must use for the various properties you want to configure.

https://technet.microsoft.com/en-us/library/aa997663(v=exchg.150).aspx

https://technet.microsoft.com/en-us/library/bb123981%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396

https://technet.microsoft.com/en-us/library/aa998221(v=exchg.150).aspx

https://technet.microsoft.com/en-us/library/ee617215.aspx

Hi,

These documents should be helpful for you.

And what's the specific command or script you are using to import these contacts information? We can help if you need assistance with it.

Best Regards.