Just to clarify in the face of a language barrier :) ... do you want to know what percentage of active users would make the implementation successful? Or something else?

I whant to know when it is good using SharePoint as ECM system platform.
First mark is number of active users ( 1000, 10 000, more).
Second mark is resources for customizing this platform for the needs of business (small company, big company, project groups, etc.).

Oh ok, I understand better now.

Any size company can make use of SharePoint. I am a one man band and I use it, my biggest client has 28000 users and they use it. SharePoint can be used for different things so size doesn't really matter. All sizes can get benefit from using it as an ECM system, just that smaller companies don't need such a complicated set up like bigger companies do.

I really wouldn't be able to comment on what the magic number of users would be, maybe someone else will have better stats for you on that.

You definitely need dedicated SharePoint resources - there's a presentation from SharePoint Supported on how to determine how many resources you will need. On average their numbers work in my client base too, so it's a good start.

http://sharepointsupported.com/freebies/

Download the one called Supporting Your End Users. Slide 10 and 11 explain the maths. If it's to be a proper ECM system in a large company you'll need a dedicate project team as well as support staff.

You need to look at the client requirements and demographic first before you can make any determination. No two clients are exactly alike when it comes to SharePoint, so it's difficult to put numbers to things.

Thank you)
It's interesting info )