Just in case you all are wondering...
Messages of the forum: The basic capacity for all the forums is 8 million messages, it can be increased to 4 billion if you exceed it...
Subjects of the forum: The basic capacity for the subjects is 65 000, which can be increased to 8 million... then to 4 billion...
Messages in a subject: 990 messages (once the limit reached, the subject is locked and splitted)
Categories/Forums/Sub-forums: 255
Avatar Gallery: 30 avatars
Smilies: 150 (Including the 94 smilies by default)
Portal Modules: 119 modules in addition of the available ones (News, Recent_topic, Search, Poll, Who is online, Statistics)
Topic icons: 25 in addition to the default ones (Normal-Sticky-Anouncement)
Characters in the messages: 15 999 characters (Including spaces)
Characters in the description of a category: 255 characters
Characters in the title of a topic: 255 characters
Groups: 32 groups
Ranks: 225 ranks
Characters in "Site Name": 96 characters
Characters in "Site Description": 255 characters
Characters in Forum address: 20 characters
Characters in personnalized Topic icons: 15 characters
Characters in Signatures: 500 characters
Characters in Profile labels: 50 characters
HTML Pages: 127 pges
Characters in HMTL pages: 65 000 characters
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Well, I'm not worried about running out of space here, then. 