CMSMS Page total and Front End User (FEU) numbers

[tosd]

Has anybody had any experience with what size application CMSMS will practically support both in terms of the maximum number of pages and FEU user registrations?

For example would 1000 pages and 10,000 registered users be out of the question? In other words how scalable is CMSMS and what would be the limiting factors?

I have put together many CMSMS websites but have just struck one that is shaping up to be a "biggie"

Many Thanks, Michael.