Fairfax Inc. and Crum & Forster Holding Inc. Addendum to Tax Sharing Agreement

Exhibit 10.17

Fairfax Inc. and Crum & Forster Holding Inc.
Addendum to Tax Sharing Agreement

In order to align the Fairfax, Inc. Tax Allocation Agreement, effective January 1, 2000, (the “Tax Sharing Agreement” ), with tax planning strategy, and ensure that the net operating losses of Crum & Forster Holding Inc. (“CFHI”) are reimbursed by Fairfax, Inc. before their expiration, in the event CFHI implements the tax planning strategy in which they elect to file a consolidated tax return with their subsidiaries for financial tax accounting purposes under the Tax Sharing Agreement, Fairfax Inc. agrees to reimburse CFHI for net operating losses utilized in consolidation.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be executed by duly authorized officers to be effective January 1, 2005.