An organization plans to migrate to Office 365.
You need to estimate the post-migration network traffic.
Which tool should you use? calculators work for on-premises as well as Office 365 deployments. You can use the Exchange client network bandwidth calculator to estimate the bandwidth required for a specific set of Outlook, Outlook Web App, and mobile device users in your Office 365deployment. With the Skype for Business and 2013 bandwidth calculator, you enter information about users and the Skype for Business features you want to deploy, and the calculator helps you determine bandwidth requirements. requirements for a Lync Server deployment based on administrator-specified user profiles and network information.

A.
Microsoft Online Services Diagnostics and Logging (MOSDAL) Support Kit

B.
Microsoft Network Monitor

C.
Lync 2013 Bandwidth Calculator

D.
Microsoft Remote Connectivity Analyzer

Explanation:

There are calculators available to assist you with estimating network bandwidth requirements. These
Lync 2010 and 2013 Bandwidth Calculator – A Microsoft Excel spreadsheet that calculates WAN bandwidth