Move from Microsoft Exchange Unified Messaging to Cisco Unity

Summary

A request was made for details regarding the migration of voicemail services from Microsoft Exchange to Cisco Unity, including costs and decision documents. The authority disclosed an options paper outlining the technical rationale and migration strategy but withheld specific cost figures and internal correspondence.

Key Facts

• Microsoft Exchange 2016 and 2019 end of extended support is scheduled for 14 October 2025.
• Unified Messaging services (Voicemail and Auto Attendant) have been deprecated in newer Exchange versions.
• The recommended strategy is to migrate Voicemail to Cisco Unity and Auto Attendants to Cisco Unified Communications Manager.
• Email services will move to Exchange Online, with an on-premise infrastructure retained for specific mailboxes.
• The disclosed document is an 'Options Paper' authored by Francis Go on 26 July 2024.

Data Disclosed

• 14.October.2025
• 26/07/2024
• Exchange 2016
• Exchange 2019
• Version: 0.1

Original Request

Dear Sir/Madam

I understand that GTS has moved its voicemail service and Auto Attendants from Microsoft Exchange Unified Messaging to Cisco Unity Connection (Cisco Unity). I would be grateful if you could provide the following information in relation to this migration:

The date the decision was made to migrate to Cisco Unity voicemail, together with the business case, decision paper, or executive / summary document supporting the decision (where held).

Any department/board which remains on Exchange UM.

The total implementation or migration cost (or cost range, if a single figure is not recorded), including licences, consultancy and migration services where available.

Copies of internal email correspondence relating to the decision to migrate from Microsoft Exchange Unified Messaging to Cisco Unity, limited to the period covering:

the decision-making and approval stage, and the commencement of implementation.

For clarity, I am not seeking detailed technical configuration information, system security architecture, credentials, or vulnerability-related material. Where exemptions apply, I am happy to receive emails or documents in a redacted form, and I would be grateful if you could provide an accompanying schedule explaining the exemptions relied upon.

If any part of this request is exempt, please provide the remaining disclosable information.

Many thanks