Through Technology Limited

Cloud Email Migration & Consolidation Service

Our service provides end-to-end migration of email and file data between cloud services and from legacy systems to the cloud.

Office 365 Exchange Online, Google G-Suite, On-Premise Microsoft Exchange 2010 onward, Lotus Notes, Zimbra etc.


  • Strategic Solution Leadership and Governance
  • Identification, planning and management of legacy supplier dependencies
  • Supporting internal communications and business engagement
  • Infrastructure Impact Assessment and migration toolset configuration
  • Solution and Process Design, Validation and Testing
  • Mailbox Migration
  • Changes including DNS, SPF, DMARC, DKIM, TLS, MTA-STS, MX, etc
  • Mail and Calendar Co-existence
  • Government-specific email solutions: CJSM, GCF, GSI, PSN, NCSC Mailcheck etc.
  • Migration of GSI GCF Email Services to secure public cloud


  • Business Continuity and Co-existence throughout migration
  • Fully Managed Process
  • Minimal user downtime
  • No loss of email
  • Comply with government email security guidance
  • Proven experience with large public sector migrations (50,000+)
  • Technology and Toolset agnostic
  • Proven experience migrating data from incumbent/exiting suppliers


£500 a person a day

Service documents

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If you use assistive technology (such as a screen reader) and need versions of these documents in a more accessible format, email the supplier at Tell them what format you need. It will help if you say what assistive technology you use.


G-Cloud 12

Service ID

6 4 6 5 8 4 2 2 0 2 1 0 1 3 5


Through Technology Limited John Waddington
Telephone: +44 (0)7913334794


Planning service
How the planning service works
Our service provides an end-to-end migration of email data to the cloud. Discovery activities will help quantify the migration and address key issues such as co-existence, shared mailbox consumption and licensing. Planning activities will work closely with the customer to define a migration schedule that minimises any potential business impact. We can work easily as part of a wider infrastructure migration programme, tying our activities into a wider migration schedule with other suppliers and processes. We will undertake or assist with infrastructure impact assessment and configuration of the target environment. Ensuring a performant end solution aligned with government security guidance. Migration approaches will be tailored to meet the customer needs for speed or transparency of migration.
We will work closely with the customer to help create exciting, plain English, clear and concise business communications and engagement material.
Planning service works with specific services


Training service provided
How the training service works
Our service will provide a clear exit plan upon conclusion, including transfer of all project documentation and knowledge transfer sessions with the customer's internal or incumbent supplier teams.
Training is tied to specific services

Setup and migration

Setup or migration service available
How the setup or migration service works
Our service provides customers with the benefit of in-depth experience on mail migration at an enterprise scale in UK Government. Including migrations from multiple source systems, for multiple semi-autonomous business units and working with the customer's multi-supplier / multi-source / disaggregated supply chain.

We support migration and configuration of co-existence between public cloud solutions (Google and Microsoft) and from vendor-specific private clouds such as DXC SecureCloud / Helion-G.

Our teams support a variety of tooling and methodologies and will select the most appropriate solutions and approaches to meet the customer/user need.
Setup or migration service is for specific cloud services
List of supported services
  • Microsoft Office 365 Exchange Online
  • Google G-Suite
  • On Premise Microsoft Exchange 2010 and above
  • Lotus Notes
  • Zimbra Mail
  • CJSM
  • Commvault Archives
  • Enterprise Vault Archives
  • And other cloud and on-premise email solutions

Quality assurance and performance testing

Quality assurance and performance testing service
How the quality assurance and performance testing works
Through Technology's standard quality assurance processes will be applied throughout.

We will undertake commissioning trial activities to test the performance and operation of migration tooling and approaches to ensure accurate planning and scheduling of migration activity and minimise any associated business impact.

Security testing

Security services
Security services type
  • Security strategy
  • Security design

Ongoing support

Ongoing support service
Types of service supported
  • Buyer hosting or software
  • Hosting or software provided by your organisation
  • Hosting or software provided by a third-party organisation
How the support service works
We offer full service desk support. Including User and license management, Health checks, Monthly utilisation reporting, System notifications, Ad-hoc administration support, Ad-hoc end user support

Service scope

Service constraints
Not inclusive of toolset provision as we will work with existing customer toolsets if required.

User support

Email or online ticketing support
Email or online ticketing
Support response times
Support response times will be determined with the customer based upon the planned migration approach and schedule. Typically migrations will use the customers ticketing system to facilitate working with your users and other suppliers.
User can manage status and priority of support tickets
Phone support
Phone support availability
9 to 5 (UK time), Monday to Friday
Web chat support
Support levels
This is a migration engagement for which we would specify support levels in agreement with the customer, based upon their existing support capability and the required migration schedule and "beat rate".

Outside of migration activities, we offer user support services separately through our TT Cloud Services Support offering on G-Cloud lot 3.


Supplier type
Not a reseller

Staff security

Staff security clearance
Conforms to BS7858:2012
Government security clearance
Up to Security Clearance (SC)


£500 a person a day
Discount for educational organisations

Service documents

Request an accessible format
If you use assistive technology (such as a screen reader) and need versions of these documents in a more accessible format, email the supplier at Tell them what format you need. It will help if you say what assistive technology you use.