Yes, CUWL "Basic" licenses include the Single Inbox feature;
Cisco Unity Connection user and interoperability functions are offered under a single, low-cost Basic user license that you can use for all core functionality (voicemail, unified messaging, or integrated messaging). An Enhanced user license provides all the user and interoperability functions available with the Basic license plus the Cisco Survivable Remote Site Voicemail capability for branch-office users. Enhanced licensing provides a second standby mailbox at the branch office for remote users. Both Basic and Enhanced capabilities are provided with Cisco Unified Workspace Licensing (UWL).
Cisco SpeechView (transcription services) is an additional per-subscriber subscription based license providing Speech to Text capability.
The Cisco Enterprise License Manager (ELM) hosts Cisco Unity Connection licenses. The Cisco ELM can be running on the same server as Cisco Unity Connection or on a remote server.