All access to mailbox data should take place through the .ost file, but I haven't actually put a network sniffer on it.
--
Sue Mosher, Outlook MVP
Author of Microsoft Outlook 2007 Programming:
Jumpstart for Power Users and Administrators
http://www.outlookcode.com/article.aspx?id=54
"-harri" <(E-Mail Removed)> wrote in message news:406370F7-C62E-4A22-B503-(E-Mail Removed)...
> Outlook 2003 SP2 Backend: E2K3 SP2
> Outlook: Corporate Workgroup Mode
>
> When "cached mode" is enabled, and if the user has autoarchive set up for
> the default folders, does the aurtoarchive use the .ost file to determine
> what should be auto archived or does autoarchive work against the server?
>
> thanks -Harri