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With so many Outlook apps and services, it can be confusing to know which version you're using.

To find out which version of Outlook you're using, select a tab below.

There are now two versions of Outlook for Windows: new Outlook for Windows and classic Outlook for Windows.

To determine if the Outlook for Windows version you're using is new Outlook or classic Outlook, check if there's a File tab on the ribbon. If File doesn't appear, you're using new Outlook. If you have a File tab, you're using classic Outlook.

New Outlook 

Icon for new Outlook This is the new Outlook mail icon. It might also include the word NEW.

When you open new Outlook, you'll see the following tabs on the ribbon: Home, View, and Help. This version includes  ​​​​​​​Settings which is available in the navigation header. Settings is where you can customize your Outlook experience.

Screenshot of new Outlook ribbon

New Outlook for Windows is available now. For more information about how to get new Outlook for free, see Getting started with the new Outlook for Windows and Start using new Outlook for Windows.

Check which version of new Outlook you're using

To check what version number of Outlook you're running:

  1. Select  Settings .

  2. Choose General, then About Outlook. The version information will be on the right.

Image of new Outlook for Windows version information with 'General' and 'About Outlook' highlighted.

Classic Outlook

Icon for classic Outlook This is the classic Outlook for Windows icon. This version has a File tab on the ribbon.

The File tab takes you to the area of the app where you can find information about the accounts you're using in Outlook, which product version you're running, and the Options area which is where you can customize your experience.

Screenshot of classic Outlook ribbon which includes File in the tab options.

Classic Outlook is a desktop app that must be downloaded and installed. The classic Outlook app is included with many Microsoft 365 subscriptions that include the desktop apps, and versions of Office such as Office Home & Business. 

Check which version of classic Outlook you're using

  1. In Outlook, choose File.

    This is what the ribbon looks like in Outlook 2016.

  2. Select Office Account. If you don't see Office Account, choose Help. You'll see the product version on the right side of the page.

  3. The Outlook version and build number is under Product Information.

  4. If you need to know whether you're using the 32-bit version or the 64-bit version of Outlook, select About Outlook.

    Choose the About Outlook box.

  5. About Outlook contains additional details about your version.

    Screenshot showing the name of the product, the version you're running, and if it's 32 or 64 bit.

Some Outlook features are only available as part of Outlook for Microsoft 365 or the Office Insider program.

Select File > Office Account. If you see Microsoft 365 or Office Insider, you're running Outlook for Microsoft 365 Current Channel or an Insider build.

See File > Office Account to find your Outlook version.

My Outlook doesn't look like this, but I'm using a Windows 10 or Windows 11 PC

If you’re using Windows 10 or Windows 11, and your Outlook doesn’t match the images here, there are two possible reasons.

  1. You’re using an older, unsupported version of Outlook, you can often find the Outlook product version by selecting Help > About.

  2. You’re using Windows 10 or Windows 11 Mail. Windows 10 or Windows 11 Mail is a free program included with all Windows 10 or older Windows 11 computers. If you’re using Windows 10 Mail, your Inbox will look something like this.

    What the ribbon looks like when you have the Mail app for Windows 10.

    Important: Changes are coming to these versions of Outlook. Learn more in Outlook for Windows: The Future of Mail, Calendar, and People on Windows 11.

Follow these steps to find out which version of Outlook is installed on your Mac.

Also see, The new Outlook for Mac.

  1. Open Outlook.

  2. On your menu bar, choose Outlook (next to the Apple logo). If you don't see your menu bar, move your mouse to the top of your screen and it will appear.

    To see what version of Outlook you have, choose Outlook on your menu bar.
  3. Choose About Outlook. The version information appears.

    If you have Outlook through your Microsoft 365 subscription, it won't display the version year.

    If you have Outlook through Office 365, About Outlook will say Office 365 subscription.

To access web-based versions of Outlook, first connect to the Internet. Go to the usual sign in location for the account you use with Outlook. 

After signing in, if the URL begins with, you're using

If the URL domain contains or, you're using Outlook on the web.

Note: Note, depending on your region, the domain URLs for the web versions of Outlook might end in something other than .com. / / is a free, web-based email service from Microsoft for personal use.

You sign into this web version of Outlook with a personal Microsoft account (such as an,,, or account).

The domain for is typically: (The .com part of the domain may be different depending on your region.)

Screenshot showing home page​​​​​​

Outlook on the web

Outlook on the web for Microsoft 365 for business is the web version of Outlook and is used in business and education settings.

To access this version, you must sign in with your work or school account. This is the account assigned to by the IT Admin or whoever manages your organization's Microsoft 365 subscription.

The domain for Outlook on the web is: or (The .com part of the domain may be different depending on your region.)

Screenshot showing Outlook on the web home page

Outlook Web App (for Exchange 2016)

Outlook Web App is used only in work or school environments that are hosting their own Exchange Server.

To get to your contacts, from the app launcher Office 365 app launcher icon click People.

What the ribbon looks like in Outlook Web App

If you have an iPhone or iPad, or an Android phone or tablet, the Outlook product you're using is Outlook Mobile. 

You can add any email account that uses POP or IMAP, as well as, Gmail, Yahoo, and work or school accounts you use with Microsoft 365 / Office 365 business subscriptions or Exchange.

To find the version number of Outlook for iOS on your iPhone:

  1. In Outlook on your mobile device, select Settings > Help & Feedback.

  2. Scroll to the bottom of the page. The version number appears there.

A picture of what Outlook looks like on an iPhone.

Related articles

 What's the difference between a Microsoft account and a work or school account?


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