NEWMailSite 11

Keep Outlook.
Lose Exchange.

MailSite 11 includes a new MAPI server for native email, calendar and contact support for Classic Microsoft Outlook. Keep the desktop workflow your team knows, without the headaches of Exchange.

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Classic Outlook Inbox connected to MailSite 11, showing messages and a reading pane
Classic Outlook connected to MailSite 11. View full size

Lower Total Cost of Ownership (TCO)

The total cost of running a MailSite server is substantially lower than the cost of running an Exchange server. To give you an example of the potential savings, we have created a cost comparison table to allow you to compare the costs for different number of users.

Cost line itemMailSite SE Full SubscriptionExchange Server SE Standard$ Savings% Savings
License Cost $2,500$12,450$9,95079.9%
Hardware Cost $3,550$15,757$12,20777.5%
Administration Cost $6,200$12,400$6,20050.0%
Illustrative annual total$12,250$40,607$28,35769.8%

License cost assumptions

MailSite SE Full Subscription includes one year of anti-spam, anti-virus, calendaring, ActiveSync and MAPI subscriptions; its prices come from the online catalog’s full subscription SKUs. Microsoft requires a server license and user or device CALs for Exchange Server SE. The Exchange estimate uses $750 per server per year and $105 per user per year for Standard CALs, the midpoints of a Microsoft Q&A moderator’s rough ranges, plus $1 per user per month for anti-spam and malware protection. Exchange licensing varies by agreement; this is not a Microsoft quote.

Hardware cost assumptions

MailSite uses one continuously running AWS t3.xlarge Windows VM (4 vCPU, 16 GiB RAM); its release notes list an 8 GiB minimum. Exchange uses one r6i.4xlarge Windows VM (16 vCPU, 128 GiB RAM), following Microsoft’s recommended minimum for the mailbox role. Both include 5 GiB of gp3 storage per user. Costs use AWS’s instance rates, instance specifications, Windows license rate, and storage rate. Actual deployments must be sized separately.

Administration cost assumptions

This planning example uses a fully burdened annual cost of $155,000 per full-time administrator, including salary, benefits and overhead. At 500 users, Exchange assumes 0.4 full-time equivalent (FTE), or $62,000 per year; MailSite assumes 0.2 FTE, or $31,000 per year. Both scale proportionally for smaller user counts.

These are illustrative staffing assumptions, not measured requirements or guaranteed savings. Actual administration needs depend on your deployment.

Rates and estimates checked September 23, 2026. Backups, bandwidth, redundancy, migration, taxes, Windows Server CALs, and other products are excluded. Ask Rockliffe for a quote above 500 MailSite mailboxes.

Complete Client Compatibility

Use Classic Outlook, popular desktop and mobile apps, or ExpressPro in a browser.

App IconApp NameProtocol Compatibility
Microsoft Outlook ClassicMAPI over HTTP for email, calendars and contacts
Thunderbird DesktopIMAP or EWS for email; TbSync with ActiveSync for calendars and contacts
macOS Mail, Calendar and ContactsExchange Web Services (EWS)
iOS Mail, Calendar and ContactsExchange ActiveSync
Android GmailExchange ActiveSync
Web Browser (ExpressPro)HTTPS for email, calendars and contacts

Review Outlook compatibility and compare synchronization options.

Easy to Run and Administer

Create mailboxes, manage domains, configure security and monitor service activity. The new MailSite Console delivers easy-to-use daily administration.

See MailSite Console →
MailSite 11 Console with server settings and domain navigation

For your business. For your customers.

Small and midsize businesses

Provide modern email and collaboration with straightforward administration and control over where your data lives.

MailSite for business →

Hosting providers

Manage multiple domains, delegate administration and plan capacity around the customers you serve.

MailSite for providers →

Organizations with their own infrastructure

Evaluate client compatibility, security and clustering against your operational requirements.

Explore deployment options →

See what's new in MailSite 11

A new MAPI server, new EWS server, new ActiveSync server, new ExpressPro, native ClamAV integration, Bayesian spam filtering and deployment without IIS.

Explore the features

Review the release notes and validate your client workflows before production migration.