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Office 0365 Plans

 

Office 365 service family Plans
Business maximum 300 users

Office 365 essentials
Office 365 business
Office 365 business plus

Enterprise unlimited number of users

Office 365 entrprise E1
Office 365 entrprise E3
Office 365 entrprise E4
Office 365 entrprise K1

Education unlimited number of users

Office 365 education E1
Office 365 education E3
Office 365 education E4

Government unlimited number of users

Office 365 government E1
Office 365 government E3

 

source: https://technet.microsoft.com/en-us/office/dn788955.aspx