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License & Subscription Issues

Microsoft 365 Business Standard & Exchange Online Plan 2 Storage Limits

Maira MehtabMaira Mehtab Sep 22, 2026 870 views

Question details

The user wants to clarify the mailbox and archive storage capacities when using Microsoft 365 Business Standard with Exchange Online Plan 2, and whether Exchange Online Archiving can replace Plan 2.

Product
Microsoft 365 / Exchange Online
Device & OS
not provided
Scenario
Evaluating email storage limits, archiving options, and potential plan combinations for a business subscription.
Observed behavior
Seeking confirmation on whether combining specific plans yields a 100 GB mailbox and 100 GB archive, and understanding the exact role and limitations of the Exchange Online Archiving add-on.
Before you start

Before modifying your subscription, verify your current Microsoft 365 plan details in the Microsoft 365 admin center and assess your organization's actual mailbox and archiving storage needs.

Solution 1Recommended

Clarifying Storage Capabilities for Business Standard and Plan 2

Understand the exact mailbox and archive limits provided by each plan to optimize your organization's subscription costs.

Microsoft 365 Business Standard natively includes a 50 GB mailbox. However, upgrading or adding Exchange Online Plan 2 changes these storage capabilities significantly.

Exchange Online Archiving is an add-on feature that requires an eligible base plan and cannot act as a standalone replacement for Plan 2.

1
Identify Business Standard Limits

By default, a Microsoft 365 Business Standard subscription provides a maximum 50 GB primary mailbox per user without any additional add-ons.

2
Understand Exchange Online Plan 2 Limits

Applying Exchange Online Plan 2 provides a 100 GB primary mailbox and a 100 GB online archive. This plan also includes auto-expanding archive capabilities for users who need additional space over time.

3
Evaluate Exchange Online Archiving

Exchange Online Archiving is an add-on that requires an existing Exchange Online plan to function. It does not replace Plan 2. If you do not require a 100 GB primary mailbox, combining Exchange Online Plan 1 with the Archiving add-on may be a more economical choice.

Cost Optimization Tip: Assess whether your users truly need a 100 GB primary mailbox. If they only need archiving space, Plan 1 plus archiving offers substantial storage at a lower monthly cost.
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Frequently Asked Questions

Does Exchange Online Archiving provide a primary mailbox?

No, Exchange Online Archiving is strictly an add-on for archiving purposes and requires an underlying Exchange Online base plan (like Plan 1) to function.

What is auto-expanding archiving in Exchange Online Plan 2?

Auto-expanding archiving automatically adds more storage space to your archive mailbox when the initial 100 GB limit is reached, ensuring your business never runs out of archiving space.

Can I mix and match Exchange Online plans in my organization?

Yes, Microsoft allows you to assign different Microsoft 365 or Exchange Online plans to different users based on their individual storage and archiving requirements.