Exchange Online (Plan 1): 50 GB per user mailbox.
Exchange Online (Plan 2): 100 GB per user mailbox.
Exchange Online (Plan 1): 50 GB archive (fixed)
Exchange Online (Plan 2): Unlimited archive (auto-expanding up to 1.5 TB)
Exchange Online (Plan 1): ❌ No
Exchange Online (Plan 2): ✅ Yes
Exchange Online (Plan 1): ❌ Not supported
Exchange Online (Plan 2): ✅ Fully supported
Shared mailboxes up to 50 GB are free.
If more than 50 GB or placed on hold → Exchange Online (Plan 2) license required.
Yes, just reassign the license in Microsoft 365 Admin Center.
Both plans support up to 150 MB per message (including attachments).
Exchange Online (Plan 1): Basic only
Exchange Online (Plan 2): Full compliance, retention, and eDiscovery support
Yes, you can assign different plans to different users.
Exchange Online (Plan 1): Best for basic business email (50 GB mailbox, no compliance).
Exchange Online (Plan 2): Best for enterprises needing larger mailboxes, unlimited archiving, compliance, DLP, and legal hold.
