I bought C-Organizer Pro a few years ago after testing many PIM's.
It's v3.7, and I can't talk about newer versions.
v3.7 is 32-bit but I run it on my Win 7 64-bit with no issues.
You might try the latest version. I've been meaning to, though I'd have to pay full boat again because of the upgrade policy. 40 bucks. I'm cheap about buying sofware, but I would do it if I like it. I've been *real* happy with it.
I don't think the trial download is crippled, but not certain.
I never forget a birthday or appointment any more.
It's a mainstay for me, for addresses, phone numbers, passwords, links and misc data.
So it's not a simple reminder, but that's why I first bought it.
Recurring, and all the bells/whistles to select when you plug in the birthday.
Same with appointments.