Thanks. Please see my response below:
mkester wrote
I am hoping to find out if Nabble can do what we are looking for. I am looking to have a discussion board, with unlimited users, but private forum.
Yes.
mkester wrote
I need to be able to have users upload their files, so how big can the files be. I think that we had problems uploading files around 2MB large.
We do allow you to upload unlimited number of files. But we are not google with unlimited budget. So, each file's size has a limit to about 1 or 2MB. For very large file, you should consider using some third-party file upload services, and you can simply link to the upload from Nabble.
mkester wrote
I've read that there is no limit on the number of posts, but how about the number of forums?
No, there is no limit. Also, there is no limit on the number of forums.