Company IT systems have been hit by the worst floods in decades.
Andrew Gordon, business development manager at CData, a Microsoft solutions supplier, said a client's e-mail system in West Sussex was down for 24 hours due to the floods. The customer lost their leased-line connection after their local exchange was flooded.
CData was preparing to put in a temporary e-mail system before the original e-mail service was restored.
Companies whose IT systems were flooded now face the decision whether to move back to their old office or relocate to a new site.
John Tucker, UK sales director for Comdisco Continuity Services, said, "Companies which have found that they are in a flood zone will probably decide to relocate."
He added that although most companies site computer rooms higher up in the building, some still locate IT equipment in vulnerable basements.