How to Import Contacts Into Outlook: A Complete Guide

Importing contacts into Outlook is one of those tasks that sounds straightforward until you're staring at a screen wondering which file format to use, where the import option is hiding, or why half your contacts showed up without phone numbers. The good news: Outlook supports several import methods, and once you understand how they work, the process becomes much more predictable.

Why Importing Contacts Matters

Whether you're switching email providers, migrating from an old device, consolidating address books, or simply restoring a backup, manually re-entering hundreds of contacts isn't realistic. Outlook's import tools let you bring contacts in bulk — but the right approach depends on where your contacts are coming from and which version of Outlook you're using.

The Two Main Versions of Outlook You Need to Know About

Before anything else, it helps to distinguish between classic Outlook (the desktop application included with Microsoft 365 or as a standalone install) and new Outlook (the redesigned web-aligned version rolling out across Windows) and Outlook on the web (accessed via outlook.com or your organization's Microsoft 365 portal).

The import steps differ between these versions, and some features available in classic Outlook aren't yet present in new Outlook. This distinction matters more than most guides acknowledge.

Supported File Formats for Contact Import 📋

Outlook recognizes a few standard formats for contact data:

CSV is the most universal and widely supported format. If you're coming from Gmail, Apple Contacts, or another email service, exporting as CSV is usually the cleanest path. PST files carry entire Outlook data sets — contacts, emails, calendar entries — making them ideal for full migrations. VCF files are contact-specific and useful for one-off imports or transferring contacts from Android or iOS devices.

How to Import Contacts in Classic Outlook (Desktop App)

This process applies to Outlook versions included with Microsoft 365 and older standalone installs on Windows.

Step 1: Open Outlook and click File in the top-left corner.

Step 2: Select Open & Export, then click Import/Export.

Step 3: In the Import and Export Wizard, choose Import from another program or file and click Next.

Step 4: Select your file type — typically Comma Separated Values for CSV files or Outlook Data File (.pst) for PST imports — then click Next.

Step 5: Browse to your file, choose how Outlook should handle duplicates (allow, replace, or don't import), and click Next.

Step 6: Select the destination folder. For contacts, choose the Contacts folder associated with your account.

Step 7: Outlook will display the action it's about to take. Click Finish.

Field Mapping: The Detail Most People Skip

When importing a CSV, Outlook may not automatically match every column in your file to the right contact field. The Map Custom Fields button in the wizard lets you drag and drop columns from your source file onto Outlook's contact fields. If your CSV has a column called "Mobile" but Outlook expects "Mobile Phone," the data may import into the wrong field or not at all without this step.

Importing Contacts Into Outlook on the Web

The web version of Outlook has a simpler but less flexible import option.

Step 1: Go to outlook.com and sign in.

Step 2: Click the People icon (contacts) in the left sidebar.

Step 3: Select Manage (or the menu icon depending on your view), then choose Import contacts.

Step 4: Upload a CSV file in Google CSV or Outlook CSV format.

The web version doesn't support PST imports. If you need to import a PST, the classic desktop app is required.

Importing VCF Files (vCards)

VCF imports work slightly differently. In classic Outlook, you can drag and drop a VCF file directly into the Contacts folder, or double-click a VCF file to open it and save it as a contact. For bulk VCF imports (a file containing multiple contacts), the Import/Export Wizard handles these under the same workflow. 📱

On some systems, Windows will associate VCF files with the People app rather than Outlook, which means double-clicking may open the wrong application. Checking your file associations or using the Import Wizard directly avoids this confusion.

Common Problems That Affect Import Outcomes

• Encoding issues: CSV files saved with non-standard character encoding (common with contacts containing accented characters or non-Latin scripts) can display garbled text. Saving the CSV as UTF-8 before importing usually resolves this.
• Blank fields after import: This typically points to a field mapping mismatch, especially when the source file came from a non-Microsoft platform.
• Duplicate contacts: Outlook's duplicate handling during import is functional but not sophisticated. It matches on name and email address, so contacts with slight variations may slip through as duplicates.
• PST account mismatch: PST files are tied to a specific Outlook profile. Importing a PST from a different account may require additional configuration, particularly in organizational Microsoft 365 environments with stricter data policies.

The Variables That Shape Your Experience 🔧

How smoothly this goes depends on factors that vary significantly from one user to the next: whether you're running classic or new Outlook, the source platform your contacts are coming from, how consistently your contact data was formatted before export, and whether you're working within a personal account or a managed Microsoft 365 organization (where IT policies may restrict certain import options).

Someone migrating from Gmail with a clean, consistently formatted CSV will have a very different experience than someone working from a legacy PST file on a managed corporate account. The process is the same on paper — but the results, and the troubleshooting required, depend entirely on what you're starting with.