Limits on BI4 Inbox

Hi people.

This is the question: is it possible to limit the size of the Web-I inbox of BI4 users?

- I searched for an Application (on CMC->Applications) to find an entry named "BI mail" or similar, but nothing found

- I searched for "Limits" on top-level folder of Inbox (as in Personal Folder and Public folders), to apply a maximum number of documents to recive, but there's no limit

Does the Inbox have no limits to receive documents?

thanks in advance

Vincent