Office 365 Enterprise plans (including E1 – E4, A2-A4, G1-G4, and SharePoint Online Plan 1 and Plan 2)

Storage base per tenant

10 gigabytes (GB) base customer storage.

Storage per user (contributes to total storage base of tenant)

500 megabytes (MB) per subscribed user.

Storage base per tenant

10 GB + 500 MB per subscribed user + additional storage purchased. . For the maximum number of users (500,000), the base storage allocation is 25 Terabytes (10 GB + 500 MB * 500,000 users), and you can purchase more storage.

Site collection quota limit

Up to 100 GB per site collection.

Site collections (#) per tenant

3000 site collections (other than Sky Drive Pro personal sites).

SkyDrive Pro storage allocation

7 GB (as soon as provisioned). This amount is counted separately, and does not add to or subtract from a tenant’s overall storage pool.

Public Website storage limit

5 GB

File upload limit

250 MB per file.

Maximum number of users per tenant

1 – 500,000

 Note    If you have more than 500,000 users, please contact the Microsoft represenative to discuss detailed requirements.