I'm not sure, however, it is my understanding that the solution can scale. 

We are kind of odd in the fact that we have several different file shares. It's hard to gauge how widely used this particular product is used. Whoever wants to use it, it uses it. It's probably strange for most companies. I would imagine most companies don't do it that way.

Whether you have one terabyte or two terabytes of data, your performance is going to remain the same. Box has tens of thousands of servers. Their speed for uploads and downloads and performance is standard for everyone. You are not going to get better than the next guy, no matter how big your company grows or how many people you have in your company. It is not going to be slow for any of your customers.

It's okay. It hasn't been a problem.

In our production environment, we manage twenty-one million files, and based on my assessment, scalability appears to be excellent.

I rate Box ten out of ten for scalability.

We have not had any challenges with scalability. 

We've deployed it campus wide and currently have nearly 100K active users - a very large deployment. We have not had any issues with scalability from the user perspective. That's been rock solid. However, we have had scale issues with the admin console. With our number of users, sometimes reports can't complete or queries take a very long time. Box is addressing that now with new reporting technology.

With perhaps 200,000 users, we have had no issues with scalability. 

There were no scalability issues. Many GBs are stored with 100 guests/clients/suppliers without any issues.

The solution is scalable.

No.

Box is quite scalable, they offer several types of subscriptions. There's a free version that allows you to use it with almost full-feature access. Even in the free version, it gives you all you need.

I have seen cases where the number of people using it in an organization goes as high as 1,000.

It is easily scalable, we started with a few users and worked our way up. Only minor changes to our folder structures was needed.

There were no scalability issues.

No, scales excellently.

We have not had scalability problems.

No issues encountered so far, except for large files (we have some 50GB+ files who we now have to split up

We have a limited document size (no more than 50MB) so we don't have any scalability issues.

We have not encountered any scalability issues.

We've had no issues with scalability.

There were no scalability issues.