Checked by Hanny Ramzy on 25 September 2026. We used AI to help write it. We then checked it against Microsoft's own product pages and documentation.
Office 365 and Microsoft 365 are mostly the same thing under two names. On 21 April 2020, Microsoft renamed its small business and home Office 365 plans to Microsoft 365. Microsoft said that only the names changed, not the prices or features. If your invoice, an old quotation or your IT person still says “Office 365”, you almost certainly have a Microsoft 365 plan.
There is one catch. The old Office 365 Business Premium is not today’s Microsoft 365 Business Premium. It is today’s Business Standard. The table below shows every rename.
We sell a competing product, so we used only the pages of Microsoft for every fact below.
What each old business plan is called now
Microsoft renamed four small business plans on 21 April 2020. The renames happened automatically. Nobody had to do anything:
| Old name (before April 2020) | Name today |
|---|---|
| Office 365 Business Essentials | Microsoft 365 Business Basic |
| Office 365 Business Premium | Microsoft 365 Business Standard |
| Office 365 Business | Microsoft 365 Apps for business |
| Microsoft 365 Business | Microsoft 365 Business Premium |
The trap is in rows two and four. “Business Premium” was the top Office 365 small business plan. Then the name moved to the plan above it. If a supplier quotes “Business Premium” and your old invoice also says “Business Premium”, check the date. The old plan had the Office apps, email and file storage. Today’s Business Premium adds device management and extra security, so it is a bigger plan.
At the same time, Office 365 ProPlus, the apps-only plan for large companies, became Microsoft 365 Apps for enterprise.
Home plans: Personal and Family
Office 365 Personal became Microsoft 365 Personal. Office 365 Home became Microsoft 365 Family, which the owner can share with up to five other people. These consumer plans do not include email on your company domain or the Microsoft 365 admin centre.
Where the name “Office 365” still exists
Microsoft kept the Office 365 name for its enterprise plans. These plans are for companies of any size, including those with more than 300 users. Microsoft lists two families:
- Office 365 E1, E3 and E5. The Office apps (on E3 and E5), email, file storage and online services.
- Microsoft 365 E3 and E5. Everything in the matching Office 365 plan, plus Windows 11 Enterprise, device management with Microsoft Intune, sign-in protection with Microsoft Entra ID (Plan 1 in E3, Plan 2 in E5) and Microsoft Defender security tools.
At the enterprise level, Microsoft 365 is Office 365 plus Windows and security. In May 2026 Microsoft added Microsoft 365 E7. It is E5 plus the paid AI assistant Copilot, and extra identity and AI agent tools.
Since 1 April 2024, new customers buy these enterprise plans in a version marked “(no Teams)” and buy Teams separately. Companies that already had a plan with Teams can keep and renew it. Read the plan name on a quotation carefully.
What today’s business plans include
Microsoft designed its four business plans for companies of up to 300 users. This table shows what Microsoft lists for each one, as of September 2026:
| Plan | Mailbox on your domain | Word, Excel, PowerPoint, Outlook | Teams | Cloud storage (OneDrive) |
|---|---|---|---|---|
| Business Basic | 100 GB | Web and mobile only | Yes, or a “(no Teams)” version | 1 TB per user |
| Business Standard | 100 GB | Desktop, web and mobile | Yes, or a “(no Teams)” version | 1 TB per user |
| Business Premium | 100 GB, plus an archive that can grow to 1.5 TB | Desktop, web and mobile | Yes, or a “(no Teams)” version | 1 TB per user |
| Apps for business | No mailbox | Desktop apps | No | 1 TB per user |
These details matter when you compare the plans:
- Desktop apps. Business Standard and Business Premium let each user install the apps on up to five PCs or Macs, five tablets and five phones. Business Basic has no desktop apps.
- Security. Business Premium adds Microsoft Intune for company laptops and phones. It adds Microsoft Defender for Business against malware and ransomware, and Defender for Office 365 for email. It has a more advanced Microsoft Entra ID for sign-in security. It also includes an upgrade to Windows 11 Pro.
- Apps for business is the old Office 365 Business. It has the apps and OneDrive, but no company email and no Teams.
- Copilot. Microsoft also sells Business Standard and Business Premium “with Copilot”, with its AI assistant built in. On the other plans, Copilot is an add-on.
Which one do I have?
The way to check depends on your role. An admin and a user have different steps.
If you are the admin, sign in to the Microsoft 365 admin centre at admin.microsoft.com. Go to Billing > Your products. If your admin centre opens in the simplified view, select Subscriptions instead. You must be a global admin or billing admin to see this page. It lists each subscription with the product name, the number of licences and the status. The page uses the current names. A subscription that you bought as Office 365 Business Premium shows as Microsoft 365 Business Standard.
If you are a user, open Word (or Excel) on your computer. Go to File > Account. Under Product Information you see the product name, such as Microsoft 365 Apps for business. Your work email address is under User Information.
Both screens show one of the current names from the table above. If Word shows Office Home and Business 2021 or Office Professional 2021, you have a one-time purchase of the desktop apps. It is not a subscription. Microsoft support for Office 2021 ends on 13 October 2026. After that date it gets no more security fixes.
If you cannot see any of this, ask the person who set up your Microsoft account. That is often an outside IT supplier.
The app and website names changed too
The confusion does not stop at plan names. Microsoft renamed its home app and website several times:
- The app. What was “Office” became the Microsoft 365 app and then the Microsoft 365 Copilot app. In August 2026 Microsoft announced a simpler name: the Microsoft 365 Copilot app is now Microsoft Copilot. The new name and icon started on 18 August 2026. The wider rollout starts in mid-September, so you can see either name for a while.
- The website. On 25 September 2026, office.com and portal.office.com both sent us to m365.cloud.microsoft. Microsoft announced that the web app is moving to copilot.cloud.microsoft, with automatic redirects from the old address.
None of this changes your account, your email or your files. You sign in with the same work email address. To learn what the new name means, and which Copilot is free or paid, read Microsoft Copilot: What Happened to the Microsoft 365 App.
How we checked this guide
Every fact comes from pages of Microsoft. We used its March 2020 announcements of the rename, its plan descriptions on Microsoft Learn, its Partner Center announcements up to September 2026 and its support articles. We tested the office.com and portal.office.com redirects on 25 September 2026. We did not include prices, because they differ by country and supplier.
We used AI to help write this guide. Hanny Ramzy then checked every plan name, rename and menu path on 25 September 2026. We will update this page when names change again.
Choosing between Microsoft 365 and Google Workspace?
If you compare Microsoft 365 with Google Workspace for your team, WhatsApp our team on +60 16-916 3324 and we will talk it through with you. We sell Google Workspace, so we are not neutral. Tell us what you use today. We will say plainly if a move makes sense.
To see what Google Workspace costs in Ringgit, read our Google Workspace pricing in Malaysia. If you decided to switch, our migration guide explains how we move email, calendars and files.
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Hanny Ramzy runs Office Niaga at Web Impian Sdn. Bhd. (SSM 920163-H) in Kota Bharu, Malaysia, helping businesses and agencies move to Google Workspace and business email with Ringgit billing and local support.