Story

Confluence for wiki, intranet and collaboration
JIRA for task tracking and workflows.
Trim for final document management.
Sharepoint for shared document editing, personal workspace, NOT for wiki pages
Lync for IM
ServiceDesk for CRM, customer tickets, customer interaction.

Pity Jira isn't up to the same level of CRM Servicedesk can do. RT3 was previously used to good effect.

Internal IM must support file transfer. Plenty of options out there.