It has been suggested that you can benefit from use of the Palm Desktop software for both PC and Mac, even if you don’t own a Palm handheld.
The software is available for free at Palm.com, and even without the handheld, you get a really good address book and calendar application. If your PC is set up to have Outlook as the default mail client, you can send e-mail, using the Palm Contacts portion of Palm Desktop, directly through Outlook. And if you do need a calendar or Tasks-type list, those are all here too.
The reason Palm Desktop runs so well is that it probably hasn’t had a major update in the past five or more years, and that makes it eminently suited to older PCs (and Macs — it runs on OS X and OS 9).
And did I mention that it’s free?