NEWMailSite 11

Keep Outlook.
Lose Exchange.

MailSite 11 provides secure business email, calendars, contacts, webmail, mobile synchronization, and native support for Classic Outlook—without the operational burden of Exchange.

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Classic Outlook Inbox connected to MailSite 11, showing messages and a reading pane

MailSite for your business

SMB IT teams

Run email, calendars, contacts, and Outlook support on infrastructure you manage.

For business IT teams

Enterprise / regulated organizations

Retain established Outlook workflows while simplifying messaging operations and deployment.

For enterprises

Hosting providers / MSPs

Deliver secure, scalable Windows email hosting built for shared and managed services.

For hosting providers

Centralized administration

Create mailboxes, manage domains, configure security and monitor service activity.

MailSite Console
MailSite 11 Console with server settings and domain navigation
MailSite ExpressPro browser workspace with folders, message list and reading pane

Supports browser, mobile, and desktop access

Email, calendars and contacts with straightforward administration.

Email, calendar, contacts, mobile synchronization, web access, centralized administration.

ExpressPro

Infrastructure you control.

Security

Built-in anti-malware and anti-spam capabilities, with administrative controls designed for teams operating their own mail environment.

Bayesian spam filteringBayesian filteringNative ClamAV integrationClamAV integrationTLS/certificate handlingSecurity documentation

MailSite vs. Exchange

MailSite is for organizations that need business email and Outlook-compatible groupware but prefer to operate their own Windows-based messaging infrastructure instead of maintaining Exchange or moving every workflow to a cloud suite.

Compare with Exchange Server

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.

Compare with Office 365

Annual subscriptions for the user count selected above.

Cost line itemMailSite SE Full SubscriptionOffice 365 E1$ Savings% Savings
Subscription per user / month $2.08$10.00$7.9279.2%
Annual subscription$2,500$12,000$9,50079.2%

Savings are for subscriptions only.

Subscription pricing assumptions

Savings use the Office 365 subscription as the baseline, before rounding. Hosting, administration and included features differ.

MailSite’s monthly figure is its annual mailbox bundle divided by the selected users and 12; it is not a monthly billing offer. Microsoft US list prices checked September 29, 2026, with an annual commitment and annual payment. Taxes, promotions and negotiated discounts are excluded.

Office 365 E1 includes hosted email with a 50 GB primary mailbox per user, Teams, web and mobile Office apps, OneDrive and SharePoint. MailSite provides email server software; these productivity services are not included. Neither subscription includes a desktop Outlook license. The MailSite hosting estimate above allows 5 GiB of storage per user; storage and features differ between these offerings.

Office 365 includes email hosting. MailSite runs on your own infrastructure, with hosting and administration costs in addition to the subscription. For 100 users, the MailSite example above adds $3,550 for annual hosting and $6,200 for administration, bringing its illustrative annual total to $12,250. Microsoft tenant administration is additional and has not been estimated here. Subscription price differences alone are not total-cost savings.

Outlook & Client Compatibility

App IconApp NameProtocol Compatibility
Microsoft Outlook ClassicMAPI over HTTPS 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

Classic Outlook and mobile sync.

Start evaluation

Keep Outlook and simplify your messaging environment.

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