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ADVANTAGE 365: Rental, Sales, and Service ERP from RMI Corporation

ADVANTAGE 365 at a glance
VendorRMI Corporation
HeadquartersAvon, Connecticut, USA
OwnershipPrivately held
DeploymentCloud, built on Microsoft Dynamics 365 Business Central and the Microsoft 365 stack
Target marketSmall and midsize US businesses that rent, sell, and service equipment
IndustriesTrailer rental, container rental, medical equipment, general and heavy equipment rental
PricingNot published; quote-based (training and support included per vendor)
Websitermiusa.com

The short version

ADVANTAGE 365 is a cloud-based business system for companies that rent, sell, and service equipment. RMI Corporation developed it, combining rental contract management, automated billing, inventory, service, and full accounting on Microsoft technology, with Microsoft Dynamics 365 Business Central as the underlying platform. The proposition is narrow and clear: US rental and equipment dealer businesses get ERP-grade accounting and rental operations in one system instead of a rental tool bolted onto separate bookkeeping software.

Where ADVANTAGE 365 comes from

RMI Corporation is a privately held software company based in Avon, Connecticut, serving the equipment rental industry since 1983. That is a long run in vertical software. The company is a long-standing Microsoft partner and independent software vendor; earlier generations of its rental solution were certified for Microsoft Dynamics NAV, and ADVANTAGE 365 carries that lineage onto the cloud-based Dynamics 365 Business Central stack. Microsoft alignment has been a constant of company strategy for decades, and it shapes both the technology and the day-to-day user experience.

Core functionality

Rental management covers automated recurring billing and flexible payment structures. Accounting runs from the general ledger through profit and loss reporting. Inventory is real time, with parts replenishment and reorder automation, while service and maintenance management handles inspections, repairs, and alert workflows. Sales functionality covers new and used equipment as well as accessories, alongside purchasing, asset lifecycle and ROI tracking, and dispatch management for route planning and crew coordination. RMIPay adds integrated payment processing. The system connects with Microsoft 365 applications including Outlook, Excel, Teams, Word, and Power Automate, plus Avalara for sales tax automation, and business intelligence and reporting round out the scope.

Typical customers

Small and midsize US companies that earn from rental, sales, and service at the same time. RMI names trailer rental, container rental, medical equipment, and general equipment rental as focus verticals, and it markets a dedicated path for startup rental businesses. Organizations already standardized on Microsoft 365 are a natural fit, since the system reuses that ecosystem for email, documents, and workflow automation.

Deployment and pricing

Delivery is cloud software on the Microsoft stack, with data synchronized across devices. RMI does not publish pricing; quotes are prepared individually. The vendor states that implementation, unlimited training, and support, including around-the-clock critical support, are included in its offering, which shifts the comparison against vendors that bill those services separately. For budgeting beyond license fees, our ERP cost guide covers the typical cost blocks of a system rollout.

Editorial verdict

The right buyer is a small or midsize rental and dealer operation that wants one integrated system with a mainstream accounting core, and that values not having to negotiate training and support hours line by line. The Business Central foundation is the genuine differentiator against proprietary rental platforms: customers get a standard Microsoft ERP backbone plus a rental vertical layer, from a vendor with an industry track record going back to 1983.

Large multi-branch fleets with complex dealer requirements should look elsewhere; dealer-focused enterprise platforms are built for that scale, and RMI is a small, specialized firm by comparison. Even the right-sized buyer should quote at least one other Business Central-based rental ISV before deciding, because the platform advantage is shared with those competitors and the real difference then lies in the vertical layer and the service commitment. Our ERP selection guide helps structure that shortlist.

What the ADVANTAGE 365 website looks like

Current view of the vendor homepage, captured by our editorial team.

Screenshot of the ADVANTAGE 365 vendor homepage

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Frequently asked questions

What is ADVANTAGE 365 and what is it built on?

ADVANTAGE 365 is an integrated business system for companies that rent, sell, and service equipment, developed by RMI Corporation in Avon, Connecticut. It combines rental management, automated billing, inventory, service, purchasing, and full accounting in one cloud product. The system runs on Microsoft Dynamics 365 Business Central, so the accounting core is a mainstream ERP rather than proprietary bookkeeping, and it is designed to work with the wider Microsoft 365 ecosystem. RMI has been a Microsoft partner and independent software vendor for many years, and earlier versions of its rental software were certified for Microsoft Dynamics NAV. In practice, users work with familiar Microsoft tools such as Outlook, Excel, Teams, and Power Automate alongside the rental system.

Which industries does ADVANTAGE 365 serve?

RMI focuses on equipment rental and dealer businesses in the United States, with named verticals including trailer rental, container rental, medical equipment, and general equipment rental. The vendor also markets a dedicated path for startup rental companies. The common profile is a small or midsize operation that combines rental, sales, and service revenue and wants one system across all three.

What does it cost, and what is included?

RMI does not publish list prices for ADVANTAGE 365; quotes are prepared individually based on company size and scope. According to the vendor, the offering includes full system implementation assistance plus unlimited training and support, with critical support available around the clock, which affects the total cost comparison against vendors that bill those services separately. Customer references highlight hands-on guidance during the transition to the new system. As with any small vendor, prospective buyers should verify response times and support staffing with current customers of a similar size. Regardless of what is bundled, ask for a multi-year cost projection covering subscriptions, integrations, and payment processing fees.