I'm looking to mass update activity history to a list of leads and contacts. Ideally, I want to use the lead or contact email address as the unique identifier then add an entry to activity history based on the information below in mass.

Example CSV:

Email Address, Marketing Email Delivered: <title>, Date

I'm on a Mac OS X (10.5.5) and am using Saleforce.com Professional version. Is there a way to do this?

Thanks,

Kimberly