Max Number of Outlook Contacts

I am working on interfacing my Access 2000 contact database to Outlook's Contacts using VB6 and I have several questions.

1) Is there a practical limit to the number of contacts allowed in Outlook?

2) How can I create a subfolder from VB6 in the Outlook Contacts that can hold the contacts brought in from Access so as not to over right or otherwise mess with the main Contacts folder in Outlook?

3) How can I copy the contacts from Access to Outlook and have the contact overwritten (If that is the option I have selected) if it already exists. (I have been able to write a record to Outlook's contacts but if I try to write the same record three times I end up with three records in Outlook that are identicle.) How can I have it prompt me if the record exists (Only if selected as an option) to see if I want to overwrite it or not?

Any help here would be most appreciated.

Rev. Michael L. Burns