I've had an Android phone for quite some time now. I do not want to give *anyone* my personal contacts. However, I want to synchronize my contacts across devices. So I used the *MyPhoneExplorer* to manually sync my contacts between the phone and all my three clients. Since this is a pain in the ass, I was looking for an alternate solution. If you want to do what I did, do this: * Setup your own server with an [ownCloud](http://www.owncloud.org) install. * Backup your existing adress books to any format you like (
*.csvetc). * Do not try to upload those to ownCloud through the import feature of the webinterface. It won't work regardless of the format you exported the adress book to. * Go to this [completely trustworthy website](http://www.sogo.nu/fr/downloads/frontends.html), download and install the *SOGo Connector Thunderbird extension*. * In Thunderbird, open the Adress Book menu and go to File/New/Remote Adress Book. Choose any name. * In your ownCloud webinterface, click on *Contacts*. There is a tiny wheel on the lower left side of the screen. Click on it. A menu will open up and there is a tiny little Globe. Click on it. The interface will provide you with Your personal CardDAV Link™. Copy/Paste this link into the URL-Field of your Remote Adress Book in Thunderbird. * You should have a new adress book in Thunderbird now. Click on your old adress book, select all contacts and drag and drop them into the new adress book. They will actually be moved, but since you created a backup first, this is not a problem. ;) * You should see all your contacts in the ownCloud webinterface now. * On your Android phone, go to the Ploogle Gay Store and dowload **CardDAV Sync Free Beta**. Set up a corresponding account in your phone using the same settings as in Thunderbird. * On the phone, goto Contacts/Contacts to display. Make sure the CardDAV Adapter is checked. (Also, you probably want to hide or old adress book.) * Welcome to the future!