Apart from logging when and who, is it also possible to somehow log WHAT has changed (like $attribute + $old_value was changed by $who at $date)

 No, this is not possible.

We are using elog to allow users to enter their time spent on a project and we would like them to be able to see the entries that they themselves have

created but not the entries that other users have created.

Thanks,

Herman

 In that case you have to make one logbook per user and restrict the access to it using the "Login user = ..." directive.

 I understand.

Thank you for the quick response.

It is possible that the Move to... and Copy to... commands can be configured so that when they operate on a message that is part of a thread, that only that message will be moved, instead of the whole thread?

 This has not been implemented on purpose. Assume you have a thread with

A

    B

       C

So A links to B, B links back to A and so on. If you would move now B into another logbook, A and C would point to an entry which does not exist any more. Furthermore, C may contain some sentences which are a reply to something which has been said in B. So even if the "Move To" mechanism would re-link A to C and C to A, the entry C would maybe make no sense any more if B is missing. That's why you only can move threads as a whole. If you want to move individual messages, don't use replies. You can actually disable the reply command in the configuration file.