CONFIDENTIAL TREATMENT REQUESTED EIGHTH AMENDMENT TO AMENDED & RESTATED MASTER SERVICES AGREEMENT

Exhibit 10.7.8

CONFIDENTIAL TREATMENT REQUESTED

EIGHTH AMENDMENT TO

AMENDED & RESTATED MASTER SERVICES AGREEMENT

This Eighth Amendment (“Eighth Amendment”) effective as of December 18, 2015 (“Eighth Amendment Effective Date”) is by and between Synacor, Inc. (“Synacor”) and Qwest Corporation, on behalf of itself and as agent for its Affiliates (“Client”) under which the parties hereto mutually agree to modify and amend the Amended & Restated Master Services Agreement, effective as of April 1, 2012, as amended (including the exhibits, schedules and amendments thereto, the “Agreement”) as provided in this Eighth Amendment. All terms defined herein shall be applicable solely to this Eighth Amendment. Any capitalized terms used herein, which are defined in the Agreement and are not otherwise defined herein, shall have the meanings ascribed to them in the Agreement.

In consideration of the premises and mutual covenants contained herein, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereby agree to amend and modify the Agreement, effective as of the Eighth Amendment Date, as follows:

Term. This Agreement shall be effective as of the Effective Date and shall continue thereafter in full force and effect through December 31, 2013 (the “Initial Term”). Thereafter the Agreement shall automatically renew initially through December 31, 2016 and thereafter will automatically renew for up to five (5) periods of one (1) year each (each such renewal period shall be referred to as a “Renewal Term”, and together with the Initial Term, the “Term”), provided however that either party may prevent automatic renewal by providing the other party with at least 180 days prior written notice of non-renewal.

7.4 Wind-Down. Upon the expiration or termination of this Agreement for any reason, Synacor will continue providing the Services (the “Wind-Down Services”) for a period of at least [*] months and not to exceed [*] months from the date of such expiration or termination if resulting from non-renewal by either party or termination by Client due to uncured breach by Synacor, and not to exceed [*] months if terminated by Synacor due to uncured breach by Client, in order that Client may achieve an orderly transition of such Services to another vendor (such period of time to be the “Wind-Down Period”). The terms and conditions upon which Synacor shall provide such Wind-Down Services shall be the same terms and conditions as shall have been in effect on the day preceding the date of such expiration or termination of this Agreement, subject to the modified fee structure specified in Schedule A for the Wind-Down Period, and Client commits that for the first [*] months of the Wind-Down Period, neither Client nor anyone on Client’s behalf, will redirect any traffic or migrate any users away from the Services.

CONFIDENTIAL TREATMENT REQUESTED

IN WITNESS WHEREOF, the parties hereto have executed this Eighth Amendment as of the date set forth below their respective signatures, to be effective as of the Eighth Amendment Effective Date.