>I start the object with:
>
>pop3 = CREATEOBJECT("JMail.Pop3")
>
>Then I do tests with AMEMBERS
>
>AMEMBERS(arrayPop3, pop3, 3 )
>
>&& returns OK
>
> AMEMBERS(arrayPop3, pop3.Messages, 3 )
>
>&& returns OK
>
> AMEMBERS(arrayPop3, pop3.Messages.item, 3 )
>returns message " Invalid number of parameter"
>
>
>But if I display pop3.Messages with intelisense, the item member is there
>What can it be ?

Like Sergey said, Item is a method which will return an object - but you need to supply a parameter, so it would know which one to return from the collection. The trouble begins with the start - do the collection indexes start with 0 or 1? Or, if you don't want to use numeric indexes, how to get the members' keys. Another trouble is at the end - how many members does the collection have. Now this number may be in .messages.count or .messages.length or some other property.

If starting from 0

with pop3
   for i=0 to .messages.count-1
      loMsg=.messages.item(i)
...

If starting from 1

with pop3
   for i=1 to .messages.count
      loMsg=.messages.item(i)