You may have to export them for outlook then import them into eM Client
Hope that this helps
Using Outlook 2013
Then Import/Export
When the Import and Export Wizard comes up
Select Export to a File
Select Next
Select Comma Separated Vales
Select Next
Scroll to the Contact
Name the File
Click Next
This screen will validate what you want to do
Click finish
All Done
Open the other program and then Import them.
The file will be save in the Documents folder
Never used the program so I do not know the steps