Hi,
The easiest way to sync contacts between Outlook and iPhone is to use Apple iTunes. Let's take Outlook 2007 for example, after the initial setup, each time that you connect your iPhone or iPod touch to your computer, the changes made on your computer or
device are synchronized.
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Connect your iPhone or iPod touch to your computer using the cable provided with your device or by placing the iPhone or iPod touch in the Apple Universal Dock.
iTunes opens automatically when connected to your computer.
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In iTunes, in the source list, under Devices, click the entry for your iPhone or iPod touch.
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Click the Info tab.
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Under Contacts, click Sync contacts from, and then click
Outlook.
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Do one of the following:
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To synchronize all contacts, click All contacts.
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To limit the contacts that are synchronized, click Selected groups, and then click the groups you want to synchronize.
Note To select multiple groups, press CTRL as you click each group name.
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Click Apply.
For more details, you can refer to this Microsoft Article:
Synchronize Outlook and Apple iPhone or iPod touch contacts
There are some other methods such as to use an Outlook.com or Exchange Account, since in both accounts the contacts are synced to Outlook client, for details you can refer to this article:
How to Sync iPhone Contacts With Outlook 2013 or 2010
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
By the way, I'm not sure how what file it is in your original post that is shared with people, but I think you can easily share a contact folder with other users in your corporation within Outlook.
Regards,
Melon Chen
TechNet Community Su