OneBeacon Professional Partners to Offer Podiatrist Medical Malpracti...(laims arising from catastrophic events s...),Health

earthquakes, floods or terrorist attacks;

-- recorded loss and loss adjustment expense reserves subsequently proving

to have been inadequate;

-- the continued availability and cost of reinsurance coverage;

-- the continued availability of capital and financing;

-- general economic, market or business conditions;

-- business opportunities (or lack thereof) that may be presented to it

and pursued;

-- competitive forces, including the conduct of other property and

casualty insurers and reinsurers;

-- changes in domestic or foreign laws or regulations, or their

interpretation, applicable to OneBeacon, its competitors or its

clients;

-- an economic downturn or other economic conditions adversely affecting

its financial position;

-- other factors, most of which are beyond OneBeacon's control; and

-- the risks that are described from time to time in OneBeacon's filings

with the Securities and Exchange Commission, including but not limited

to OneBeacon's Annual Report on Form 10-K for the fiscal year ended

December 31, 2006 filed February 28, 2007.

Consequently, all of the forward-looking statements made in this press release are qualified by these cautionary statements, and there can be no assurance that the actual results or developments anticipated by OneBeacon will be realized or, even if substantially realized, that they will have the expected consequences to, or effects on, OneBeacon or its business or operations. OneBeacon assumes no obligation to update publicly any such forward-looking statements, whether as a result of new information, future events or otherwise.