One major complaint I hear from Microsoft Partners about Office 365 is that have no way to get an overview of all their online customers in one place. The reality is that there is, all they need to do is login to the Microsoft Partner site (http://mspartner.microsoft.com) with their organizational details.
After login select Membership from menu that appears across the top. That should display a drop down menu and from here select Online Services Dashboard as shown above.
You should then see a number of different boxes like that shown above. In the Office 365 box in the Manage Customers section you will see how many Office 365 customers you have (screened here for privacy) for example.
If you then click on that box you will drill down further to what you see above that lists the total customers, any deployment opportunities and a list of customers and their subscriptions below. You can filter, sort and select much of the information displayed here.
If you go back a screen and scroll down you will find a Partner of Record box in the menu. Selecting that display the above screenshot. Here you can see how many customers you are partner of record for and how many have been switched from you (or lost). You’ll also get a list of these customers below this.
So if you are a Microsoft Partner and haven’t taken a look at the Online Services Dashboard then you should login and have a look around at all the great information Microsoft has provided right at your finger tips. I’ll bet it is exactly what you have been looking for!