Action: Calculate the number of clients to use per IP address - It is important to understand Network Address Translation ...

Action: Calculate the number of clients to use per IP address - It is important to understand Network Address Translation (NAT) support with Office 365 and how it impacts the number of users and client devices you can have serve with an IP address. For instance, Outlook may open eight or more connections (in situations where there are add-ins, shared calendars, mailboxes, etc.). Because there is a maximum of 64,000 ports available on a Windows-based NAT device, there can be a maximum of 8,000 users behind an IP address before the ports are exhausted. You'll want to calculate the maximum supported devices behind a single IP address prior to deploying Office 365. Learn more at NAT support with Office 365.