Cisco tech note 118828 states that up to 1800 users can be configured with a single Office 365 unified messaging service.
Checked 2026-09-30
You can configure up to 1800 users with a single Office 365 Unified Messaging Service.
- Vendor
- Cisco
- Product
- Cisco Unity Connection
- Subsystem
- unified messaging
- Deployment
- on-premises
- Region
- not restricted
- Release range
- printed as Release 8.x and later; not confirmed for the Graph API integration
- Checked
- 2026-09-30
Sources
- Configure Unity Connection for Office 365 — Cisco Systems · tier 2 current vendor documentation · Configure > Unity Connection > note on users per Unified Messaging Service
Cite this note
APA
WarmTransfer. (2026, September 30). Setting up Unity Connection single inbox with Microsoft 365: source note unity-connection-single-inbox-setup-technote-1800-users. WarmTransfer. https://warmtransfer.net/knowledge/claims/unity-connection-single-inbox-setup-technote-1800-users
BibTeX
@misc{warmtransfer-claim-unity-connection-single-inbox-setup-technote-1800-users,
title = {Setting up Unity Connection single inbox with Microsoft 365: source note unity-connection-single-inbox-setup-technote-1800-users},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/unity-connection-single-inbox-setup-technote-1800-users},
note = {Source note unity-connection-single-inbox-setup-technote-1800-users, checked 2026-09-30}
}