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I want to have my registered users be added to an address book to use it as a Contacts page on an intranet. This list should include a phone number/fax number/email/IM handle/job title/office... is there a way to make this?
There is a greater scope for usuer management in the xops 2.2x series, including customisable fileds such as you request here. Otherwise, look for membership modules, address modules, etc in 2.0.x series.
You can solve problems for users who cannot post or login by disabling the HTTP referrer check (or by users allowing referrer information through the firewall).