How to: Block or unblock a contact in Skype for Business on Windows


Instructions

1) Right-click on the contact's name and choose Change Privacy Relationship.

example screenshot

2) Change the contact relationship to or from the "Blocked Contacts" option.

example screenshot

OUTCOME

If you blocked the contact, they won't be able to contact you via Skype for Business. If you unblocked them, they will be able to contact you.