Forty-one percent of enterprises do not allow employee-owned Macs access to any company resources, even Web-based e-mail, according to the results of a new Forrester survey of IT executives at North American and European companies.

Forrester asked 590 IT executives and technology decision-makers if employee-owned Macs are granted access to resources like Web-based e-mail, hosted applications and virtual desktops, internal networks, and native e-mail applications. Forty-one percent answered “none of the above.”