How Do I Make an Email Group in Outlook?

To make an email group in Outlook, open the People page and build a contact list of the addresses you send to repeatedly. In classic Outlook for Windows the sequence is People, then Home > New Contact Group, type a name, select Add Members and choose From Outlook Contacts, From Address Book or New E-mail Contact, then Save & Close. In new Outlook for Windows, Outlook on the web and Outlook.com the same object is called a contact list: select People, select a contact, choose Add to list, then New contact list. Microsoft's support article covering both routes, "Create, edit, or delete a contact list (or contact group) in Outlook," applies to Outlook for Microsoft 365, Outlook 2024, 2021, 2019 and 2016, Outlook.com, and new Outlook for Windows.

That takes roughly two minutes, and it buys less than most people assume. A list built this way sits in the Contacts folder of one mailbox, and Microsoft's Exchange Online service description is blunt about the cost: "a distribution group that is stored in the organization's shared address book counts as one recipient. In a personal distribution list, each recipient is counted separately." Against a daily ceiling of 10,000 recipients, a 400-name personal list spends 400 on every send. The same names in the shared address book spend one.

Classic Outlook for Windows: the New Contact Group path

Microsoft's documented sequence runs six steps:

1. On the Navigation bar, choose People.
2. Select Home > New Contact Group.
3. In the Contact Group box, type the name for the group.
4. Select Contact Group > Add Members, then choose From Outlook Contacts, From Address Book or New E-mail Contact.
5. Add people from your address book or contacts list and choose OK. Hold Ctrl to select several at once.
6. Choose Save & Close.

New E-mail Contact is the option worth knowing about. It accepts an address that exists nowhere in the address book, which is what anyone listing clients, parents or subcontractors actually needs. Ctrl+Shift+L opens a blank Contact Group form from anywhere in Outlook.

To use it, type the group name in the To box of a new message. Outlook expands it into individual addresses before sending.

New Outlook, Outlook on the web and Outlook.com: contact lists

The object did not change; the label did. Microsoft's support documentation states that in new Outlook, Contact Lists are "formerly referred to as 'Contact Groups' in classic Outlook."

Select People on the side panel, select the contact to add, choose Add to list by right-clicking it or using the ribbon, then choose New contact list. To change a list later, open it, choose Edit, adjust the name, description or membership, and save. Deleting a list leaves the people in it alone; Microsoft's article specifies that "Contacts are not deleted, only the contact list."

Microsoft's documentation for these three clients contains no bulk route. Every documented path begins with one existing contact, selected on its own.

Building a group from an email you already have

Classic Outlook takes a pasted block of addresses, which turns a message that already has the right people on it into a reusable group in one action.

Select the names in the To or Cc box, copy with Ctrl+C, open a new Contact Group in the main Outlook window, choose Add Members > From Outlook Contacts, click into the Members field at the bottom of the dialog, and paste with Ctrl+V. Clicking into the Members field is the step people skip, which is why the paste can appear to do nothing.

Diane Poremsky, a Microsoft Outlook MVP since 1999 who documents the technique at Slipstick Systems, states the one condition the pasted block must satisfy: "The only requirement is that each member's information needs to be delimited with a semi-colon or paragraph mark (one name and address per line)." Members need not exist in the address book beforehand; name and address travel together in the paste. The ribbon's Group button does something else entirely, building a Microsoft 365 Group.

Where the list lives decides what it costs to use

Microsoft publishes two separate sending limits, and a personal contact list runs into both of them badly.

The recipient rate limit is 10,000 recipients per day per mailbox across every Microsoft 365 Business and Enterprise plan in the Exchange Online service description. Microsoft's worked example: a user who sends to 5,000 recipients at 09:00, 2,500 at 10:00 and 2,500 at 11:00 has hit the ceiling and "won't be able to send messages again until 09:00 AM the next day."

The recipient limit is the number of addresses allowed in To, Cc and Bcc on one message, and here the sources genuinely disagree. The current Exchange Online limits table on Microsoft Learn prints "Customizable up to 1000 recipients," with a footnote confirming admins "can customize recipient limits between 1 and 1000." That table gives the ceiling and omits the default. Microsoft's own Exchange team blog post announcing the feature, "Customizable Recipient Limits in Office 365," states the limit is set to 500 for all mailboxes unless an admin changes it. Vasil Michev, a Microsoft MVP and the technical editor of Office 365 for IT Pros, wrote in January 2020 that "Ever since Office 365 launched, this limit has been 500 recipients, and could not be changed," and published mailbox plan defaults in which the ExchangeOnline plan sits at 50 while the Enterprise, Deskless and Essentials plans sit at 500.

Neither figure works as a general answer. The value is set per mailbox plan and adjustable per mailbox, so it has to come from the tenant, through the Exchange admin center or `Get-Mailbox`.

Both limits count a personal contact list member by member. A group in the shared address book counts as one. For a list that will be used more than a handful of times, the effort that returns the most is not building it faster; it is handing it to an administrator so it stops living in a Contacts folder.

Contact list, distribution group, Microsoft 365 Group

| | Personal contact list | Distribution group | Microsoft 365 Group | |---|---|---|---| | Where it lives | Contacts folder of one mailbox | The organization's shared address book | The organization's directory | | Maximum owners | No owner role exists | 100 (10 on standalone Exchange Online plans) | 100 | | Published member ceiling | None published | 100,000 | More than 1,000; only 1,000 concurrent in conversations | | Counted by the sending quota as | Every member separately | One recipient | One recipient | | Has its own email address | No | Yes | Yes, for example [email protected] | | People outside the organization | Any address, added directly | Added by an administrator | Invited as guests, approved by the owner | | Shared inbox, calendar, files | No | No | Yes | | Who creates it | The user | An administrator | The user, if the admin allows it |

Microsoft's support page draws the line in one sentence. Microsoft 365 Groups "aren't contact lists, otherwise known as distribution lists. A contact list is simply a set of email addresses that you can use to send email messages or meeting invitations to everyone at once."

External membership differs. A contact list takes any SMTP address with no ceremony. For Microsoft 365 Groups, Microsoft's admin documentation states that guest access is on by default, that "group members can invite guests to a Microsoft 365 group through Outlook on the web," and that once the owner approves, "the guest is added to the directory and the group."

Personal accounts get a reduced version. A group created with an Outlook.com, Hotmail, Gmail or Yahoo account still gets a shared inbox, address and calendar, but "it won't have shared OneNote, SharePoint or Planner resources," and is unavailable in Outlook for iOS and Android.

The ceilings Microsoft publishes

Default message size in Exchange Online is 35 MB for sending and 36 MB for receiving, and administrators can set any value between 1 MB and 150 MB. The client adds its own ceiling: 150 MB in classic Outlook and Outlook for Mac, 112 MB in Outlook on the web, 33 MB in Outlook for iOS and Android. The web figure is lower because mail leaving Microsoft datacenters picks up a 33 percent encoding increase.

Large groups get smaller ceilings, not larger. Exchange Online caps a message to a distribution group with 5,000 to 99,999 members at 25 MB, and to a group with 100,000 members at 5 MB, and marks those thresholds as including dynamic distribution groups and Microsoft 365 Groups. Any group at or above 5,000 members must have delivery management or message approval configured. The group mailbox itself holds 50 GB.

When Outlook will not let you make a group

The contact list route works on every client Microsoft's support article lists. The Group command does not, and three things explain most of its absence.

The first is an administrator. Microsoft's admin documentation states that any user can create a group "unless you limit group creation to a specific set of people," and that the restriction reaches beyond Outlook to SharePoint sites, Teams, Planner, Viva Engage and Power BI workspaces. The controls are `EnableGroupCreation` and `GroupCreationAllowedGroupId` in Microsoft Entra ID; if the second is never populated, only administrators can create groups.

The second is licensing. The full experience needs a plan carrying both Exchange Online and SharePoint. On an Exchange-only plan, Microsoft's documentation says, you still get "the shared inbox and shared calendar features of groups in Outlook but you don't get the document library, Planner, or any of the other capabilities." Delegated administrators acting for a customer cannot create or manage Microsoft 365 Groups at all.

The third is which Outlook is running. Microsoft's migration documentation places new Outlook for Windows in the opt-in stage, off by default, behind the Try the new Outlook toggle. Administrators get "at least 12 months of notice" before cutover, and existing classic Outlook installations "will continue to be supported until at least 2029." A command missing from one client is often sitting in the other.

The Bcc question, and what it has cost

Because a personal contact list expands into individual addresses on the way out, Bcc matters more for contact lists than for groups with their own address. A 200-name list dropped into To or Cc hands each of those 200 people the other 199 addresses.

The UK Information Commissioner's Office has fined organizations for exactly that. HIV Scotland was fined £10,000 in 2021 over an email sent on 3 February 2020 to 105 people using Cc rather than Bcc; 65 of the exposed addresses identified a person by name, from which an assumption about HIV status or risk could be drawn. Ken Macdonald, head of ICO Regions, said: "All personal data is important but the very nature of HIV Scotland's work should have compelled it to take particular care."

Five years earlier the same regulator fined Chelsea and Westminster Hospital NHS Foundation Trust £180,000 after the 56 Dean Street clinic sent a September 2015 newsletter to 781 recipients without using Bcc. 730 of the disclosed addresses contained a full name, and the ICO recorded a comparable incident at the same trust in 2010.

The ICO also found that HIV Scotland kept using the bcc method for seven months after identifying the risk and buying a more secure bulk messaging system. A group address removes the judgment call. Recipients of a message sent to a distribution group or a Microsoft 365 Group see the group's address, not each other's.

Frequently asked questions

How do I create a contact group in Outlook from an existing email?

Open the message, select the names in the To or Cc box and copy them with Ctrl+C. In classic Outlook, open a new Contact Group, choose Add Members, then From Outlook Contacts, click inside the Members field at the bottom of the dialog and paste with Ctrl+V. Then Save & Close.

Why can’t I create groups in Outlook?

Usually because an administrator restricted it. Microsoft's admin documentation says any user can create a group unless the organization limits creation to a named set of people, a restriction that also blocks SharePoint sites, Teams and Planner. Licensing matters too: the full experience requires a plan carrying Exchange Online and SharePoint.

How do I create a group list of email addresses?

In classic Outlook, choose People, then Home and New Contact Group, name it, select Add Members and pick From Outlook Contacts, From Address Book or New E-mail Contact, then Save & Close. New E-mail Contact accepts addresses not saved as contacts. In new Outlook or the web, use People, Add to list, New contact list.

What’s the difference between a group and contact group in Outlook?

A contact group, called a contact list in new Outlook, is a set of addresses stored in one person's Contacts folder. A Microsoft 365 Group is a directory object with its own email address, a shared inbox and calendar, up to 100 owners, and it counts as a single recipient against Exchange Online sending limits.

How do I create a distribution list from multiple email addresses?

Paste them. Copy the addresses, separated by semicolons or one per line, open a new Contact Group in classic Outlook, choose Add Members, then From Outlook Contacts, click in the Members field and paste. Outlook MVP Diane Poremsky notes an address without a display name uses the address as its name.

When should recipients be hidden with Bcc?

Whenever the recipients do not already know they are on a list together, and always when membership of the list reveals something about them. The ICO fined HIV Scotland £10,000 for using Cc on an email to 105 people, 65 of whose addresses named them. A group address avoids the choice entirely.