IMAP mail is always left on the server until you delete it and use the Edit
| Purge Deleted Messages command. THose messages marked for deletion are
also still in the local .pst file that caches copies of the IMAP folders,
which might explain why they continue to grow in size.

Signature
Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I am using ms outlook i connected to the imap account, when ever i drag and
> drop mails or open the existing mails then the size of the local pst file
[quoted text clipped - 8 lines]
> What
> is "folder hierarchy on server" in imap server account. please help me...