New Outlook Contacts and People Settings: Location and Practical Limits

The new Outlook for Windows stores contacts and people data differently than classic Outlook. Many users cannot find where contacts are actually saved or why certain fields do not sync across devices. This article explains where the new Outlook stores contact data, how the People settings work, and what practical limits you will encounter when managing a large or shared contact list. You will learn the exact storage locations, sync behavior, and field limitations that affect daily use.

Where New Outlook Stores Contacts and People Data

The new Outlook for Windows does not use local .pst or .ost files for contacts. Instead, all contact data lives in the cloud mailbox associated with your Microsoft 365, Exchange Online, or Outlook.com account. When you add a contact in the new Outlook, the data is written directly to the People folder in your Exchange Online mailbox or to the Outlook.com contacts store. This means contacts are available on any device signed into the same account, including Outlook for Mac, Outlook mobile, and Outlook on the web. The local cache on your Windows PC is a synchronized copy, not the primary source. If you sign out or remove the account, contacts remain in the cloud and will reappear when you add the account again.

Exchange Online Mailbox People Folder

For business users with a Microsoft 365 or Exchange Online account, contacts are stored in a system folder named People under the mailbox root. You cannot see this folder in the folder pane of the new Outlook — it is hidden. To verify the storage location, go to File > Options > People. The dialog shows which account is the primary contact store. If you have multiple accounts, you can select which account stores new contacts. All contacts sync through Exchange ActiveSync or MAPI over HTTPS, depending on your mailbox configuration.

Outlook.com Contacts Store

For personal accounts using Outlook.com, Hotmail, or Live.com, contacts are stored in the Outlook.com People service. This is the same contact store used by the Outlook.com web app and the Windows 10/11 People app. When you add a contact in the new Outlook, it appears immediately in the People app on Windows and in Outlook.com. The sync is near real-time and uses the Outlook.com sync infrastructure. There is no local .pst file option in the new Outlook — all data is cloud-only.

Local Cache Location

The new Outlook maintains a local cache of contact data for offline access. This cache is stored in the Windows AppData folder under %LOCALAPPDATA%\Microsoft\Outlook\16.0\Offline Address Books for Exchange accounts and under %LOCALAPPDATA%\Packages\Microsoft.OutlookForWindows_8wekyb3d8bbwe\LocalState\Cache for Outlook.com accounts. These cache files are not editable and are rebuilt automatically when the account reconnects. Do not delete these folders manually — the app will recreate them, and you may lose offline access temporarily.

People Settings in New Outlook: What You Can Configure

The People settings in the new Outlook are limited compared to classic Outlook. To access them, click File > Options > People. The following options are available:

1. Select the account where new contacts are saved
   If you have multiple email accounts in the new Outlook, choose which account stores new contacts. Contacts created from emails or manually are saved to this account. Existing contacts are not moved.
2. Show contacts from these address books
   Check or uncheck address books to show in the People pane. This includes the Global Address List (GAL) for Exchange users, the Outlook.com address book, and any shared contact folders.
3. Export contacts
   Click Export to download a CSV file of all contacts from the selected account. The CSV includes standard fields: first name, last name, email, phone, company, and address. Custom fields and notes are not exported.

Practical Limits of Contacts and People in New Outlook

The new Outlook imposes several limits that affect how many contacts you can store, how they sync, and what fields are available. These limits are set by the underlying cloud service, not by the Outlook client itself.

Maximum Number of Contacts

Exchange Online mailboxes have a default limit of 1 million contact items in the People folder. This includes personal contacts, distribution groups, and mail contacts. Outlook.com accounts have a lower limit of 10,000 contacts. If you exceed the limit, new contacts will fail to save with an error message: “Cannot create the item. The folder has reached the maximum number of items.” To check your current count, use Outlook on the web and go to People > Manage > Export to get a CSV count.

Field Limitations

The new Outlook supports only a subset of the fields available in classic Outlook. The following fields are not available in the new Outlook contact form:

• Custom fields (user-defined fields)
• Multiple email addresses (only one Email 1 field is shown; Email 2 and Email 3 are hidden but may sync if created in classic Outlook)
• Notes field (the large text box for free-form notes is absent)
• Custom categories assigned to contacts
• Contact pictures (cannot be added in new Outlook; existing pictures sync from cloud)

If you need these fields, use classic Outlook or Outlook on the web to edit contacts. Changes sync to the new Outlook, but you cannot edit them there.

Sync Latency and Conflicts

Contacts sync between new Outlook and the cloud every 15 to 30 minutes under normal conditions. If you edit a contact on two devices simultaneously, the last save wins. There is no conflict resolution dialog in the new Outlook. To force an immediate sync, restart the new Outlook or switch to Outlook on the web and make a change there — the sync will trigger within seconds.

If Contacts Are Missing or Not Syncing

Contacts created in classic Outlook do not appear in new Outlook

Classic Outlook stores contacts in a local .pst or .ost file. The new Outlook does not read these files. To make classic Outlook contacts available in new Outlook, import them into the cloud mailbox. In classic Outlook, use File > Open & Export > Import/Export > Export to a file > Comma Separated Values. Then in new Outlook, go to File > Options > People > Export is for export only — to import, use Outlook on the web: People > Manage > Import contacts. Upload the CSV file. Contacts appear in new Outlook within 15 minutes.

Contacts show duplicates

Duplicates occur when the same contact exists in multiple address books or when auto-merge from LinkedIn or other services creates copies. In new Outlook, right-click a duplicate contact and select Delete. To prevent duplicates, turn off auto-linking in Settings > General > Privacy and data > Linked experiences. Uncheck “Suggest contacts from your other apps.”

Cannot add a contact to a shared mailbox

The new Outlook does not support adding contacts directly to a shared mailbox’s People folder. To work around this, add the contact to your own mailbox and then move it using Outlook on the web. In Outlook on the web, go to People, select the contact, choose Move to, and select the shared mailbox’s People folder. The contact becomes visible to all users who have access to that shared mailbox.

New Outlook Contacts vs Classic Outlook Contacts: Key Differences

Item	New Outlook	Classic Outlook
Storage location	Cloud mailbox (Exchange Online or Outlook.com)	Local .pst or .ost file, or Exchange mailbox
Maximum contacts per folder	1 million (Exchange) / 10,000 (Outlook.com)	Limited by file size (typically 20 GB for .ost)
Custom fields	Not supported	Supported with custom forms
Notes field	Not available	Available
Multiple email addresses	Only Email 1 shown; Email 2 and Email 3 hidden	Three email fields visible and editable
Offline access	Automatic cache; no manual control	Full offline access with .ost file
Export format	CSV (standard fields only)	CSV, Excel, PST, and more

The new Outlook for Windows stores all contact data in the cloud, which provides seamless sync across devices but removes the flexibility of local files and custom fields. You can configure the primary contact store under File > Options > People and export contacts as CSV, but you cannot edit notes, custom fields, or multiple email addresses within the new Outlook. If you rely on those features, switch to classic Outlook or Outlook on the web for contact editing. To avoid sync issues, keep your contact count under 10,000 for personal accounts and under 1 million for business accounts, and always use Outlook on the web for importing large contact lists.