Personal contact management is an application most software developers have neglected in recent years. Microsoft still dominates the landscape with its Outlook contact manager, Google on the other hand has never really had a serious offering.

Now Mozilla has entered the fray with Contacts, a contact management plug-in for Firefox.

It’s still at version 0.1, not even a beta at this stage. Which means Contacts is clunky and could cause crashes or other problems. In fact, Mozilla recommends you don’t use it with your normal Firefox profile.

The still-unfinished software promises to pull all your contacts together from a variety of sources. There are importers for:

• Twitter
• Gmail
• Gravatar Avatar Images and
• Native address book (on your computer)

The first three worked on my system. The Gmail importer works when you are logged into Google on one of your browser tabs. The Twitter importer needs a Twitter password stored in your Firefox password list. The first two work almost instantly, the Gravatar importer takes a few minutes.

At this stage, the contact list isn’t much better than Gmail’s and I found a many duplicates and unidentified contacts in my list.

Eventually, Mozilla contacts will allow you to auto-complete names and email addresses when filling on web forms.

For now, it has limited functionality, but there’s potential here. I’m particularly impressed with the data portability – keeping one set of contacts on my desktop and laptop.

Have you tried Contacts? What do you think of it?

Plaxo is part social media tool, part address book. It is useful for keeping contacts names and addresses up-to-date.

Useful, but not as elegant or as handy as alternatives such as Linkedin.

Plaxo has a chequered history. In the early days Plaxo messages would turn up in my email all the time. They looked like spam and were annoying. The company climbed aboard the cluetrain and the unpleasant stuff stopped.

While Plaxo needs to make money – don't we all? I'm not sure the company's current approach will work. It certainly doesn't work for me.

Plaxo operates a so-called "Freemium" business model. The basic product is free, if you want to do more with the tools you have to pay. In theory it is a good business model and there are many cases where it works well.

I've recently come across three ways Plaxo aims to get money from me. I don't think I'd pay for any of these:

1. Outlook sync. This was free, with a paid-for version allowing more features. Now sync is part of Plaxo Premium and costs US$60 a year – around a NZ$100.
2. Then there's Plaxo Pro available in three versions; Basic, Plus and Power. The Power version is a whopping US$250 a month and essentially provides you with a way to spam Plaxo members. It includes Premium.
3. Then there are e-cards, basically electronic birthday cards and similar stationary at a cost of US$20 a year.

You can forget the e-cards. Why would I ever want to pay US$20 to send them?

I've no need or inclination to spam people, which rules out Plaxo Pro.

Which brings us to Plaxo Premium – paying for support is fair enough. Paying for the ability to back-up is reasonable. Paying to remove duplicates is a bit on the nose, but we'll let that go. I can't use the sync to Windows Mobile and I used the Sync to Outlook when it was free and was not overly impressed.

Plaxo is an OK online address book. It's not a useful to me as Facebook or Linkedin. It has around 15 million users – Linkedin has 43 million, mainly business oriented users, Facebook has 300 million.

Which one of those is the most valuable? Certainly not Plaxo.