What Microsoft 365 is

Microsoft 365 is a collection of subscription services rather than one program. Depending on the plan and configuration, it can include business email, desktop or web Office applications, Teams, OneDrive, SharePoint, account management and security controls. Buying a licence does not automatically organise or protect the business; the value comes from configuring the parts around the people and the way they work.

The main parts in plain English

  • Exchange Online usually provides business email, calendars and shared mailboxes.
  • Outlook is an application used to reach email and calendars; it is not the email service itself.
  • OneDrive is generally each person's work file area and synchronisation service.
  • SharePoint supports shared team information, document libraries and intranet-style sites.
  • Teams combines chat, meetings and access to shared work.
  • Office applications can include Word, Excel and PowerPoint, with desktop availability depending on the licence.
  • Microsoft Entra ID manages organisational identities, sign-in and access behind the services.
  • Administration and security tools control licences, recovery methods, multi-factor authentication and policies.

The exact features and limits depend on the plan. Check the current licence description instead of assuming every Microsoft 365 subscription contains the same services.

Questions a small business should answer

Identify who owns the tenant, who holds administrator access, which domain is used for email, how starters and leavers are handled, and where shared business files should live. Decide who may share data externally and who approves access. Confirm recovery methods and multi-factor authentication are consistent. Document suppliers and renewal ownership so the business is not dependent on one person's memory.

What not to do

Do not share one account between employees or use an administrator account for everyday work. Do not remove the last working administrator or recovery route. Avoid granting access by copying another employee's permissions without checking the role. OneDrive synchronisation and recycle bins are useful, but they should not be assumed to be a complete tested backup strategy.

When to stop and ask for help

Get advice before changing domains, DNS records, mail routing, administrator roles, security defaults, retention settings or large groups of file permissions. A mistaken change can affect every user. Suspected account compromise, deleted users and broken email routing need a controlled response rather than experimentation.

Prepare for support

List the business domain, approximate user count, licence names if known, current email provider, shared mailboxes, important SharePoint or OneDrive locations and the problem you are trying to solve. Identify the authorised business decision-maker and current administrator. Do not send passwords, authentication codes, recovery codes or exported business data in an initial enquiry.