LinkedIn contacts are stored in the user's mailbox and are retained in accordance with the Microsoft 365 or Office 365 service plan. The information that's synchronized between LinkedIn and Outlook on the web includes first name, last name, all phone numbers, all email addresses, and all street addresses.

The information for each LinkedIn contact is stored as a read-only contact record in the LinkedIn folder in People. For detailed information about managing Outlook on the web mailbox policy settings, see View or configure Outlook on the web mailbox policy properties. Similar to other Outlook on the web mailbox policy settings, you can change the settings for LinkedIn contact sync by using the Exchange admin center (EAC) or Exchange Online PowerShell. You turn LinkedIn contact sync on or off for users in your organization by using Outlook on the web mailbox policy (formerly known as Outlook Web App mailbox policy) settings. Some features aren't available to mailboxes or organizations in specific regions. The features that are available to your Microsoft 365 or Office 365 organization are determined by the service plan for your account. Turn it off if you don't want your users to download their LinkedIn connections as contacts in Outlook on the web. As an admin, you probably want to keep LinkedIn contact sync turned on if your organization uses LinkedIn for business purposes, such as networking and marketing.

Linkedin and outlook