plaxologo1.pngPlaxo keeps taking substantive steps towards creating one address book that syncs across your communication services.

Now, Plaxo is offering a way to share your contacts and your calendar information back and forth between Plaxo and Windows Mobile. You can synchronize between Plaxo and Windows Mobile via your computer or your phone. You need to be a paying Plaxo member to access the service.

Plaxo already synchronizes your friends’, family’s and and coworkers’ contact information from email clients like Outlook and Thunderbird, Mac OSX and the address book in Internet Explorer. It also works with the iPhone.

The Windows Mobile sync is a logical service to charge, because many business people and others already have business contacts in Windows Mobile and Microsoft doesn’t offer a comparable way to extract your contacts.

The service had gone into pre-alpha testing back in August.