What is a good process to automatically synchronize contact lists to a Windows computer, iPhone, and VOIP telephone?

I work for a company in which the general manager has VOIP phone, Windows computer and iPhone devices.   The general manager has a list of contacts that he would like to have automatically synchronize to all of these devices.  Where would be the best place to edit this contact list and get it to synchronize to all of these devices automatically?  If there is a better process to do this I would appreciate input.  Thanks.
Who is Participating?
Eoin OSullivanConnect With a Mentor ConsultantCommented:
In my experience the GOOGLE Contacts is probably one of the best integrated solutions insofar as it works with iOS on the iPhone and Windows on a desktop/laptop.  The iCloud service works great on iPhone but not great on Windows and can be a little messy to setup with Windows People app and prefers to use Outlook which may not be desirable.
The big unknown is the VOIP phone - you'll need to provide much more detail on that .. the make/model and what VOIP service it is using.
Kyle SantosConnect With a Mentor Customer RelationsCommented:
It should be possible if all those devices allow you to use an iCloud account.  e.g. if you edit a contact on your iPhone, then it will sync to iCloud and update for all other devices using the iCloud account.
On the iPhone go to Settings
Toggle on 'Contacts'.
Qian BaoDigital Media Specialist and Web DesignerCommented:
On the Windows machine, install iCloud for Windows. It will automatically sync up calendars and contacts within Outlook.
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