The Address Book in Outlook has been a core tool for finding and selecting contacts when composing emails. With the release of the New Outlook for Windows, Microsoft redesigned how contacts are stored and accessed. The classic Outlook relied on local address books and offline address books from Exchange. The New Outlook shifts to a cloud-first model using the Microsoft 365 contact system and the Global Address List. This article explains the key differences between the two address book systems, what changed, and how to adapt your workflow.
Key Takeaways: New Outlook vs Classic Outlook Address Book
- New Outlook uses cloud contacts only: Local address books and offline address books are not supported. All contacts must be in Microsoft 365 or a connected account like Google or iCloud.
- Global Address List is read-only in New Outlook: You can view and select recipients from the GAL, but you cannot edit contact details or create new contacts there.
- Classic Outlook supports multiple address books: You can add local .PAB files, offline address books, and custom address lists. New Outlook removes these options entirely.
How the Address Book Works in Classic Outlook
Classic Outlook has supported multiple address book types for decades. The primary address book is the Global Address List from your Exchange or Microsoft 365 organization. This list contains all mail-enabled users, distribution groups, and resources. Users can also add their own contact folders, offline address books, and personal address books stored as .PAB files. The Address Book dialog (Ctrl+Shift+B) lets you choose which address list to search. You can resolve names against any of these sources when composing a message. Classic Outlook also supports custom address lists created by Exchange administrators, such as room lists or department groups.
The classic Address Book is deeply integrated with the Outlook profile. Each profile can contain multiple address books, and the order of resolution is configurable in File > Account Settings > Address Books. You can also set a default address book for name resolution. This flexibility allowed power users and organizations to maintain separate contact stores for different purposes. The offline address book is synchronized locally so users can view the GAL when disconnected from the network.
Personal Address Books in Classic Outlook
Personal Address Books (.PAB files) were the original contact storage format in older versions of Outlook. Although still supported in classic Outlook for backward compatibility, Microsoft deprecated PAB files years ago. Users can still create new PAB files and add contacts manually. These files are stored locally on the user’s computer and are not synchronized to any server. This means contacts in a PAB are only available on that specific machine unless manually exported and imported elsewhere.
Offline Address Books in Classic Outlook
The Offline Address Book (OAB) is a local copy of the Global Address List. Classic Outlook downloads the OAB during synchronization so users can browse and resolve names without a live connection to the Exchange server. The OAB is updated periodically based on the schedule set by the Exchange administrator. Users can force an update by going to Send/Receive > Send/Receive Groups > Download Address Book. The OAB is read-only and cannot be edited.
How the Address Book Works in New Outlook
New Outlook for Windows uses a completely different contact architecture. It does not support local address books, PAB files, or offline address books. Instead, all contacts are stored in the cloud. For Microsoft 365 accounts, contacts are stored in the Exchange Online mailbox’s Contacts folder. For connected accounts like Gmail, Yahoo, or iCloud, contacts are synced from those services. The Global Address List is still available for Microsoft 365 and Exchange accounts, but it is read-only. You cannot add new contacts to the GAL or edit existing ones from the New Outlook interface.
The Address Book dialog in New Outlook is accessed by clicking the Address Book icon in the ribbon or pressing Ctrl+Shift+B. The dialog shows a single search box that queries the default address list. You cannot switch between multiple address books within the dialog. The search results combine contacts from your personal contact folder and the GAL. There is no option to add a custom address list or a local address book. The People view (People icon on the left navigation) shows all your contacts from all connected accounts in a unified list.
Contact Folders in New Outlook
New Outlook creates a default Contacts folder in your Microsoft 365 mailbox. You can create additional contact folders, but they are all stored in the cloud. These folders are accessible from any device running New Outlook or Outlook on the web. You cannot create a local-only contact folder. If you delete a contact from a folder, it is permanently removed from the server after the retention period. There is no local backup unless you export your contacts to a CSV or VCF file.
Global Address List in New Outlook
The GAL in New Outlook behaves almost identically to the classic version for browsing and selecting recipients. However, you cannot open a GAL contact’s properties and edit them. The Edit button is grayed out for GAL entries. This is by design because the GAL is managed by your organization’s directory service. If you need to update a colleague’s phone number or job title, you must ask your IT administrator to update it in Microsoft Entra ID or on-premises Active Directory.
Key Differences in Address Book Features
The following table summarizes the major feature differences between the two Outlook versions.
| Feature | Classic Outlook | New Outlook |
|---|---|---|
| Local address book (PAB) support | Yes | No |
| Offline address book (OAB) | Yes | No |
| Multiple address books in one profile | Yes | No |
| Edit GAL contacts | No (read-only) | No (read-only) |
| Cloud contact sync across devices | Manual via Exchange sync | Automatic for all connected accounts |
| Custom address lists from Exchange admin | Yes | Yes (same GAL) |
| Add contacts from GAL to personal folder | Yes (copy to Contacts) | Yes (copy to Contacts) |
Common Misconceptions and Limitations
Can I use a personal address book in New Outlook?
No. New Outlook does not support personal address books or any local address files. If you have contacts stored in a .PAB file, you must import them into a cloud contact folder before switching. Use classic Outlook to export the PAB to a CSV file, then import that CSV into the New Outlook Contacts folder. After importing, the contacts will be stored in your Microsoft 365 mailbox and synced to all devices.
Why can’t I see the Offline Address Book in New Outlook?
New Outlook does not download an offline copy of the GAL. It requires a live internet connection to query the GAL from the server. If you are offline, the Address Book dialog will show only your personal contacts that are cached locally. To see the GAL while disconnected, you must use classic Outlook or Outlook on the web with offline access enabled.
Will my custom address lists from Exchange work in New Outlook?
Yes. Custom address lists created by your Exchange administrator appear in the GAL in New Outlook. You cannot filter the GAL to show only a specific list within the Address Book dialog. However, you can still search for recipients by name and the results will include entries from all address lists. There is no way to restrict the view to a single list like in classic Outlook.
Classic Outlook vs New Outlook Address Book: Key Differences
| Item | Classic Outlook | New Outlook |
|---|---|---|
| Contact storage location | Local .PAB, OAB, Exchange mailbox | Cloud only (Exchange Online or connected account) |
| Offline access to GAL | Yes, via OAB download | No, requires live connection |
| Multiple address book selection | Yes, drop-down in Address Book dialog | No, single search across all sources |
| Edit GAL properties | No | No |
| Add custom address lists | Yes, via profile settings | No, only the default GAL |
Conclusion
The New Outlook address book removes local storage options and relies entirely on cloud contacts. Classic Outlook offers more flexibility with personal address books and offline address books. If your organization depends on local contact stores or offline GAL access, you should stay with classic Outlook for now. Microsoft has not announced plans to reintroduce local address books in New Outlook. To prepare for the transition, export all local contacts to your Microsoft 365 mailbox before switching. You can use the People view in New Outlook to manage your contacts and the Ctrl+Shift+B shortcut to open the Address Book dialog.