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Sage 100 (formerly MAS 90 & MAS 200)

Grow faster, smarter with Sage 100


Sage 100 (formerly Sage MAS 90 & MAS 200) helps your growing small or medium sized company manage more than just accounting and unites your entire business with a highly customizable solution.



With over fifty years of combined Sage Software experience, and thousands of onsite hours logged at customer sites, Keystone Software Solutions has the knowledge base to provide top-notch consulting and training services. 

Few people in the country have the level of expertise that we bring to Sage software. We possess the accounting, business, and software background necessary to ensure customers have the knowledge to take full advantage of the systems features. Keystone Software Solutions is a tough act to follow.



Big ERP capacity without all the cost and complexity. We've implemented it and our customers who use Sage 100  are proving it every day. Discover their Stories...



Keystone Software Solutions is proud to offer the full line of Sage Software products.


Sage 100 ERP Accounting Software

New Name. But the exact same products that you have always known as Sage MAS 90 and MAS 200 ERP. More small and mid-market businesses choose Sage 100 systems for their accounting and business management needs than any other software in its class. 

Sage 100 Reseller
Providing Business & Accounting Software and Services!
Sage 100 Consulting

Our goal at Keystone Software Solutions is to provide effective solutions designed to boost your business, be it small or a large organization.

Our consultants design solutions tailored specifically to the needs of your business in order to ensure you achieve your future desired situation.

Check out our Sage 100 solutions and services. 


"Keystone's consistently high level of service is impressive.  You don't see that on a company's price list, it's not something tangible, but once you've got it, nothing less will do" 

Andy Wernick, Industrial Plywood, Inc. Pennsylvania

Providing SAGE 100 Business and Accounting Software and Services 

Sage 100
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