Round Cube enhancement with OwnCloud

We have a Round Cube Webmail based on postfix, Dovecot, Amavis and Roundcube. The Project has two aspects: [login to view URL] features integration to Roundcube: We would like to add Owncloud functionality to the roundcube console. The Owncloud link on Roundcube should have single signon with Roundcube user and domain. The Owncloud link on Roundcube should have support for Files and Folder, Music Files with web player, Video Files with web player, Photo Files/Albums, Notes, PDF viewers, ODF viewers, Documents Viewers and creation/edition of .doc/.xls/.ppt/docx/xlsx/pptx/odt/pdf natively in the browser screen. The Owncloud link should have support and integration with Roundcube to unload or download the email attachments directly from web brower itself from the owncloud storage on the cloud. 2. We would want a billing system for our roundcube and owncloud from the cloud: We were using ISPconfig3 but find the below two flaws there a. LDAP Directory support missing with single LDAP instance covering all the domains. b. Advanced reporting to Resellers, Customers and Admin with Reports emailing on time or event trigger features missing.