Attention Business Owners Searching for Dependable IT Support:

Frustrated By Constant Computer Problems And Lack Of Response From Your Current IT Company?

If so, schedule a quick, 10-minute discovery call and let us show you what fast, friendly and highly-responsive outsourced IT services should be for your small to medium business:

Top Industries We Serve


Property Management






IT Buyers Guide


The Business Owners’ Guide To IT Support Services And Fees

Our Services

Managed Services

You can rest easy when you put your IT support needs in our hands. Never worry about extensive downtime again with our 24/7 monitoring services.

Cloud Computing

Cloud services give you the power to collaborate using the Internet and intranet in your office to make doing business more efficient.

VoIP Solutions

We work with both hosted and on-premise VoIP solutions giving you the best solution to fit your business' needs.

Data Backup and Recovery

We use a unique system that backs up all of your domain and server information and stores it in a dissimilar server off site so you’ll always be able to access your data quickly.

IT Consulting

We provide Virtual CIO services that can simplify using your technology and benefit from IT Outsourcing.

Virtualization Services

Our virtualization experts can show you how to simplify your IT infrastructure, lower costs and improve your system reliability.

3 Big Reasons to Choose Computer Maintenance Service to Support Your Computer Network


Employees - CMS prides itself on only employing the most professional, knowledgeable, and courteous people to serve our clients. Our technicians are continually vendor trained on products we sell and service. If you need a senior network technician, printer serviced, or a web design expert, CMS has the resources to solve your problems NOW.

We do not employ want-to-be technicians. Our technicians are certified and continually furthering their education. They not only have the Certifications they are well trained and have many years of experience. CMS prides itself on the highly trained and educated employees we bring on to our IT Staff. Each technician is versed with all our clients’ networks and is involved with networks being designed, implemented, managed or simply doing the audits and making recommendations for future needs or growth. We do not assign one technician per customer; all of our technicians are able to maintain all our clients’ networks.


Experience - At CMS we have over 75+ years combined experience in the IT world. For almost 30 years CMS has been diagnosing and repairing computer systems. In that time, our team of certified technicians has seen and/or worked with products from almost every major hardware and software manufacturer. Our vast experience and proven methods insure we will get to the root of your problem quickly without wasting your time or money.

There are many things you need to consider when choosing a computer support company. Experience, responsiveness, and product alliances, are all points to look at when trusting your businesses computer operations to an outside source. CMS has certified technicians on staff ready to diagnose, make recommendations, and repair your network quickly. Once we get your organization operating smoothly we have a number of cutting edge services available to monitor and protect your systems from the growing number of everyday threats.


History And Growth - Since 1990, Computer Maintenance Service, Inc. has been providing Chicago and the surrounding areas with comprehensive on-site and depot center computing, printing, and networking support. We presently service a large customer base comprised of almost every business and public sector, as well as thousands of residential computer users.

In 2003, we expanded and moved our operations to a new state of the art facility in Mokena, Illinois. Since that time we have grown our service offerings to include digital video security systems, remote network monitoring, remote managed services, remote backup services, analog and IP based phone systems, e-mail & web hosting services, and more.

Whether you need daily support on your network or an upgrade, CMS can provide you with the prompt, professional, and affordable support that is a rarity anymore in the service industry.

See what other business owners are saying about us…

As the owner of a company the last thing I want to do is deal with a malfunctioning computer network. Not only does Computer Maintenance Service, Inc. allow me peace of mind on my network but has also designed and installed a state of the art camera surveillance system along with a new phone system. When I have a need or a concern I call CMS. With the implementation of the diverse applications, state of the art equipment I can view my company camera systems on my cell phone. If needed, I can work anywhere there is an internet connection. Not only do they fully support the hardware end they are knowledgeable and support software applications as well. I have worked with all the staff at CMS from the receptionist to the owner and they have always done a great job for our company.

Kenneth M., Owner Manufacturing

I'd like to thank you once again for all the help and support you've given us over the years. I believe we've been with you since the late 90s and I don't see us changing anytime in the near future. Since our initial server, you've installed 2 replacements and both times the transition went seamlessly. You and your staff are always there when any issue arises and you help solve the problem immediately so we don't lose data or man hours. Your ability to access our network and workstations remotely is wonderful! In addition, our nevv installations (about 30 pc's so far) have been problem free; our email rarely has any issues; and your follow up in tracking our antivirus programs and scans are priceless!

Thanks again for all you do (and how well you do it!!). We're looking forward to working with you for years to come!

Donna O., (ret.) Property Management

We hired Computer Maintenance Service to maintain our computer needs for my office. They are always quick to respond and fix any issues we have. We are very pleased with this company and recommend them.

A little extra attention given to the technicians Alex and Kurt. Both are a pleasure to work with and have always been right on with their maintenance.

Thank you both so much for your continued work in keeping this office running.

Edward J., Attorney Legal

About CMS

Computer Maintenance Service is a comprehensive small business IT support services and consulting firm, specializing in all areas of computing, networking, and printing in Chicago and surrounding areas. We help businesses increase productivity, reduce costs, and enhance employee and customer experiences.

IT Buyers Guide


The Business Owners’ Guide
To IT Support Services And Fees