In Product Announcement Guide for 7.0
Number of filenames
48 GB or approximately 1050 million (UNIX systems) or 675 million (Windows systems)
Number of file versions
10 x number of filenames
Nothing at all about the number of folders, I would see about how many files per folder, although I suspect that yopu are no where near teh max
My guess is that the IDB is getting pretty fragmented
omnidbutil -info
The ratio of Records Used vs Records Total shoud be close to 100%, in the Catalog part fo the IDB, certainly, no less than 90%