Table:
text: List of collaborative software
Comparison
Comparison
Name_ Mail_transfer_agent Mail_storage_type IMAP_server IMAP_shared Calendar_format Calendar_shared IM_server WebDAV Web_UI Contacts_shared Files_shared Web_admin_UI
Zarafa Postfix , Exim , Qmail , Sendmail , others MySQL , optional attachments on filesystem Yes Public Folder available Outlook , Webaccess, iCal , Z-Merge Outlook , Webaccess, Z-Merge No No Yes Yes No Yes
Zimbra Custom Postfix Mail Dir w/ index db Custom No iCal ICAL (Removed in v8) Yes Yes Yes Yes Yes
Name Mail transfer agent Mail storage type IMAP server IMAP shared Calendar format Calendar shared IM server WebDAV Web UI Contacts shared Files shared Web admin UI

Question: List of collaborative software comparison, what are the IMAP sharing options for software with a web user interface?