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The only Exchange with FREE Email Signatures.

big british mailbox

Industry leading business email.

Our Hosted Exchange solution has been tailored to provide the best opportunity for partners such as you to deliver an exceptional service. By choosing the Big British Mailbox from the MessageStream Cloud Marketplace, you’ve chosen the very best for your clients.

As part of this commitment, we’ve increased the storage limit of all new and existing Exchange mailboxes, making them the largest available anywhere in the UK. Your clients can now take advantage of industry-first adjustable sizes at no extra cost, from 1GB for infrequent users, all the way up to an enormous 125GB. It’s no surprise that Hosted Exchange is the most popular service in the MessageStream Cloud Marketplace.


Every Hosted Exchange mailbox now has FREE Email Signatures.

Exclusive to MessageStream partners, Email Signatures are managed for all of your clients centrally within your Cloud Marketplace.

Because it’s locally hosted from our servers it’s ultra-secure and there’s no email interception needed.

With MessageStream Email Signatures you’ll also benefit from:

  • Manage all of your clients’ signatures in the cloud
  • Signatures are applied on an organisational basis
  • Online signature designer
  • Automatic personalisation (name, role, DDI, etc)
  • FREE Outlook plugin
  • Also works with Outlook Web Access (OWA)
5 stars TrustPilot
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The Best is now the Biggest at 125GB

We’ve increased the limit of all new and existing Hosted Exchange mailboxes to a massive 125GB at no extra cost. It’s bigger than the rest, so your clients can enjoy more storage for their space for their messages, across all devices. With new industry-first adjustable sizes, from 1GB for infrequent users all the way up to 125GB it’s no surprise that the Big British Mailbox is the number one choice for IT professionals like you.

Why Exchange?

We currently manage more than 100,000 mailboxes that have been added through our 4,000 strong reseller network. Below are some of the reasons why you should be selling Exchange to your clients.



Become a subscription business

Generate consistent, predictable revenue month on month.


End-of-month billing

Receive just one invoice per month for all of your clients.


No set retail price

Charge your clients as much or as little as you like per mailbox to better manage margins.


Rebrandable Service

All Exchange services can be completely whitelabelled meaning you build your brand, not ours.


UK Hosting and Support

Your clients' data is always stored within UK shores, and operated and supported by a UK-based team.


Largest mailbox available

With adjustable sizes from 1 GB up to an enormous 125 GB, our mailboxes are the largest available in the UK.

We currently manage over 100,000 mailboxes which have been added through our 4,000 strong reseller network. Below are some of the reasons why Exchange is the best tool available for your clients.



It's the fastest growing cloud sector

With over 450 million users, Exchange is currently the fastest growing cloud sector worldwide.


Exchange dominates business email

Exchange is a professional tool designed specifically for businesses of any size.


Boost your clients productivity

With Exchange your clients emails and data are accessible on any internet device.


Better collaboration between colleagues

Exchange allows the sharing of documents, calendar, tasks and other types of business data.


Cheaper than using in-house servers

Hosted Exchange removes the need for expensive on-site servers and ongoing maintenance fees.


Exchange uses the latest security encryptions

Exchange is secure & fast, plus with MessageStream we include Anti-Virus and Anti-Spam as standard.
phone Call 0333 332 0888 to learn more about our Hosted Exchange service.
form Click here to enquire online and begin your journey today.
5 stars Client testimonials
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  • C Potts

    " huge impact on our business. "

    Hosted Exchange has had a huge positive financial impact on our business and I would advise any IT support company to start reselling the service today...

    Chris Potts - ITC Service Limited

  • S Lone

    " Excellent service with matching support "

    Simple, affordable and solid service. But it's the support that takes the cake. Very efficient. Keep marching!

    Salman Lone - TekOne

  • M Barton

    " First class service, first class support "

    Can't fault these guys, everything about their service is spot on and gives me great confidence in reselling a product to my clients that just works!

    Matthew Barton - Ostrich IT


Rich in features

Our Hosted Exchange solution has been tailored to provide the best opportunity for resellers to deliver an exceptional service to their clients. On top of our excellent Cloud Marketplace features, we offer Hosted Exchange at a low wholesale price with no long-term commitments and no set targets.

  exchange Exchange

Exchange Server 2013 technology

Mailbox size


Up to 10 email address aliases

Multiple UK-based data-centres

Optional Outlook 2016 licence

Optional Outlook 2016 Mac licence

Outlook Anywhere access

Instant 'push' email

Organisation-wide address list

Multiple domains

Shared calendars

Shared tasks

Shared contacts

Distribution groups

Room mailboxes

Mail-enabled contacts

Access multiple inboxes from Outlook

Delegate access

Mobile 'Push & Sync' technology

Sync with iPhone, iPad, Windows Phone, Android etc

Sync with Blackberry 10

Remote mobile data wipe

Data replication for peace-of-mind

Every mailbox hosted on 3x Exchange servers for ultra resilience

99.9% financially backed SLA

MessageStream Anti-Spam

Anti-Virus protection

Instant activation and provisioning

No set-up fees

40MB attachment size

Web-based multi-client provisioning portal

No minimum mailboxes

Domain name management

Exceptional Support™ - email, online and telephone

Emergency technician support

Access to migration service

Dedicated Account Manager

Monthly payment plan

End of month billing

Invoiced billing


Get in touch with us

To speak with our technical sales expert Nathan, you can call him on...

0333 332 0888

Additional features

With Hosted Exchange there are many features that can make your clients Exchange experience more productive and enjoyable. See below for some of the features that can be applied to your clients Exchange accounts via our Cloud Marketplace.

^ Denotes chargeable service.

Email security Email security including archiving up to 10 years ^

Award-winning Anti-Spam and Anti-Virus plus long-term secure email archiving.

  • Secure email archiving
  • Email retention for 10 years
  • Archives inbound and outbound email
  • Archives internal Exchange email
  • Instant email recovery
  • Domain-wide email recovery

^ This is a chargeable service

distribution groups Distribution groups

Create and manage distribution groups.

  • Help communication and collaboration
  • Specify which users in your organisation need to received messages from a distribution group
  • Ensure the maximum recipient numbers per message aren’t exceeded
room equipment mailboxes Room/Equipment mailboxes ^

Add resource mailboxes for meeting rooms, training rooms, company equipment and vehicles

^ This is a chargeable service

email rules Permissions

Easily set additional mailbox permissions (either Full or Send As) for additional users directly from your Cloud Marketplace portal.

Email security SPAM filtering

Each mailbox on our platform is covered by Anti Spam as standard. Using award-winning technology, each and every inbound email to the Hosted Exchange environment is subjected to nearly one hundred Anti-Spam tests.

To find out more about what addtional features you can add to your clients mailboxes, call us on 0333 332 0888 or click here to send us a message.

We pride ourselves on providing exceptional customer service to all of our MessageStream partners, regardless of their size or scope. We regularly achieve 5 star TrustPilot reviews and are ranked amongst the top UK companies for cloud computing.

5 stars Client testimonials
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  • N Bell

    “ Best Hosted Exchange... ”

    We got a direct mail shot from MessageStream. When I compared their offer with our exisiting supplier I couldn't believe it. We have now transferred all our hosted services to them...

    Nick Bell - Net.Result

  • D Burford

    “ Best switch I ever made ”

    Not only do our clients now have access to the latest Exchange software, they also enjoy greater storage space, and at a better price then before.

    Daniel Burford - Linten Technologies

  • G Sayers

    “ Halved our costs ”

    We migrated from another hosted provider and as well as halving our costs, we are getting significantly better service and support.

    Gordon Sayers - SortMyPC