One of the many reasons why I have found the Microsoft RMS Store Operations point of sale system to be so popular is that Microsoft still provides support directly to the end user. Most point of sale software companies direct you to a designated partner or reseller for support.
In fact, if you stay current on your RMS Store Operations software maintenance (the annual fee you pay to receive updates and revisions to the software), you are eligible for a specific number of free support calls with Microsoft (usually up to 5 per year).
If you are not current on your RMS Store Operations software maintenance then you can either pay for support or contact your location Microsoft Dynamics RMS Partner to get a quote on renewing your software maintenance.
The support number specifically for Microsoft RMS Store Operations users is 888-477-7877.