WinOMS Server vs Hosted vs Sensei Cloud: The IT Checklist for Oral Surgery Practices

It is Friday afternoon and three things are on your desk. The server in the back closet still runs Windows Server 2016. There is a quote for "the v10 conversion" that nobody in the office can quite explain. And an email from a software company says it is time to move to the cloud. Your software vendor's support line has already told you that the server, the network and the backup are your IT person's job. Before you spend money on any of it, you want to know what WinOMS actually needs.

This guide puts the WinOMS system requirements for all three setups on one page, from the vendor's current documents, checked on 26 October 2026. It gives you a decision table, a server spec sheet, the SQL licence thresholds, a v10 conversion worked example, a backup routine and the questions to ask before you sign. It is one part of our oral surgery practice IT guide, and the computers, network, server and backups around the software are what our dental IT support for oral surgery practices covers. It is written by Ian Lynch, who has 22 years in dental IT and oversees the NOC, onsite dispatch and client technology roadmaps at Legend Networking.

Who this is for:

- your WinOMS server runs Windows Server 2016, and Microsoft's extended support ends on 12 January 2027;
- a v9 (Sybase) to v10 (Microsoft SQL Server 2019) conversion is still pending;
- someone in the practice is pushing "the cloud", and you want to compare WinOMS Hosted and Sensei Cloud fairly;
- the vendor told you the network and the backup belong to your local technician, and you want to know what that covers.

Who is responsible for what when you run WinOMS?

The vendor supports the WinOMS application. Its own technician guide makes the "local technician" fully responsible for the office network, the hardware configuration, and setting up and teaching backup and restore. The practice owns the backups and the SQL licence decision. Your IT team carries most of the work around the software.

That split comes straight from the vendor's WinOMS Technician's Installation Guide (the "Tech Pack"), whose Technician Acknowledgement reads: "The local technician is fully responsible for the configuration, installation, and maintenance of the client's computer network." It adds that WinOMS support "does not train offices on configuring the backup system or restoring a database." Here is the same split, task by task.

Source: WinOMS Tech Pack OL700-03, pages 1, 4, 5 and 8; WinOMS 10.1.x System Requirements, page 7. Checked 26 October 2026.

For support with the application itself, use the vendor's WinOMS support page, which lists phone, email and chat. For the whole-office question of who to call for what, see the pillar guide.

Which WinOMS setup fits your practice: on-premises, Hosted or Sensei Cloud?

On-premises WinOMS suits a practice that wants its database in the building and has an IT team to run the server and backups. WinOMS Hosted suits an office happy to swap the server for a steady internet line. Sensei Cloud is a move to a different, browser-based product. If you are unsure about the software itself, decide that first.

The table below compares what each choice asks of your office. Every figure comes from the current vendor documents named under the table.

Sources: WinOMS 10.1.x System Requirements pages 1, 2 and 7; WinOMS 10.1.x Hosted System Requirements pages 1 to 3; Sensei Cloud System Requirements; Sensei vitals monitor integration help. Checked 26 October 2026.

Whichever column you are in, the monitor station stays a wired, local device; how to connect the sedation monitor station has its own guide. What happens on a surgery day when the server or the internet fails is covered in the surgery-day downtime plan.

Choose on-premises WinOMS if:

• • you want the database on hardware you control, and you have budget for a server refresh before 12 January 2027;
• • your IT team can run a stopped-database backup every night and check it;
• • your internet is slow or unreliable, or several surgeons work from the same building.

Choose WinOMS Hosted if:

• • you would rather pay for a strong internet line than for a server and its replacements;
• • your staff already use WinOMS and you do not want to retrain them;
• • you can wire every front-desk and monitor PC and keep the latency at 50 ms or less.

Consider Sensei Cloud if:

• • you are ready for a different product, not just a different place to run WinOMS;
• • your monitors are on the Criticare list, or you are prepared to change them;
• • you have checked every integration you rely on against its own requirements.

For the general money question of buying a new server versus moving to the cloud, our guide to dental server replacement vs cloud migration has the worksheet; this page does not repeat it.

What does "Hosted" mean for WinOMS?

WinOMS Hosted is the same WinOMS software running on Carestream Dental's servers, which your staff reach through Citrix Workspace, a remote-application client. The vendor calls the Hosted workstation a "modestly configured computer" for scheduling, billing and payments, and says it "is not suitable for image acquisition." Budget at least 2 Mbps for each simultaneous user, with latency of 50 ms or less.

Is Sensei Cloud the same as WinOMS in the cloud?

No. Sensei Cloud is a separate, browser-based practice management product from the same company, not WinOMS on a remote server. Sensei's own support page says there is "no immediate requirement to change systems" and that "Migration is optional and can be planned over time." Before you move, check these five things with the vendor in writing:

For cloud dental software more broadly, see our piece on cloud dental software (general dentistry).

Do you still need a server in the office if WinOMS is hosted or you move to Sensei Cloud?

Usually you still need something local. Imaging capture, the monitor workstation, TWAIN scanners, signature pads and card terminals stay in the building with either option. The Hosted document says the Hosted workstation is not for image acquisition, and Sensei Cloud imaging runs on locally installed CS Imaging 8. Whether you need a local imaging server is a question for your imaging vendor.

What server does WinOMS 10.1 need?

WinOMS 10.1 recommends a dedicated server with a quad-core CPU, 16 GB of RAM and 100 GB of free disk, on Windows Server 2025 or 2022 (64-bit). The minimum is a dual-core CPU and 8 GB of RAM, and Windows Server 2019 and 2016 are still supported. Remote Desktop Services is not supported, and virtual machines are not certified.

Hand this spec sheet to whoever buys the server.

Source: WinOMS 10.1.x System Requirements, pages 1 and 7; Tech Pack OL700-03, pages 8 and 9. Checked 26 October 2026.

The vendor also says "all operating systems must be kept up to date". If you are planning the hardware, our dental server setup page covers what we look at, and UPS and safe server shutdown explains why the shutdown software matters.

Is Windows Server 2016 still OK for WinOMS?

For now, but not for long. The WinOMS 10.1.x requirements still list Windows Server 2016 as supported. Microsoft's Windows Server 2016 lifecycle page shows extended support ending on 12 January 2027, and the vendor asks for operating systems to be kept up to date. Plan the server replacement and the v10 conversion as one project. The other technology dates for the year are in the pillar guide's calendar.

What about the workstations and the monitor station?

Each WinOMS workstation needs a dual-core CPU, 4 GB of RAM, 40 GB of free disk, a 3D-accelerated video card and Microsoft Edge. Windows 11 Pro is recommended; Windows 10 Pro is still on the vendor's supported list.

Source: WinOMS 10.1.x System Requirements, pages 1 and 2. Checked 26 October 2026.

Windows 10 Pro is on the vendor list, but Microsoft's Windows 10 lifecycle page shows support ended in October 2025. Both facts are true; plan the move with our guide to Windows 10 end of life for dental practices. The older Tech Pack says the v10.0 client "only runs on Windows 8.1 and Windows 10"; the current 10.1.x requirements replace that, so buy to the current document.

The monitor station needs the DB9 serial port, and the vendor says "Wireless networking is not recommended for Anesthesia." Cabling and network placement for that PC are in the guide to connecting the sedation monitor station. Vitals monitors are medical devices. Change nothing on the monitor itself without the manufacturer or your biomedical service.

SQL Server Express or Standard: which licence does your WinOMS database need?

It depends on the database size. The WinOMS Tech Pack says a database of 7.5 GB or smaller can use a SQL Server 2019 Express licence, 8.5 GB or larger prompts an upgrade to Standard, and 10 GB or larger requires Standard. Separately, Microsoft caps any Express database at 10 GB.

Keep the two kinds of number apart. The 7.5 GB and 8.5 GB figures are WinOMS licensing thresholds. The 10 GB figure is also Microsoft's hard limit for Express.

Source: Tech Pack OL700-03, page 8; Microsoft, SQL Server 2019 editions. Checked 26 October 2026.

Microsoft's editions table also limits Express to the lesser of 1 socket or 4 cores and 1,410 MB of buffer-pool memory, and Express has no SQL Server Agent, the built-in job scheduler. That last point matters for backups: on an Express server, a scheduled WinOMS backup has to be started by a Windows scheduled task or your IT team's backup tool.

What happens if an Express database outgrows its limit? The Tech Pack's troubleshooting section describes it: "A message is displayed stating the database is too large for the current version of SQL when logging into WinOMS." The screenshot on that page (p.27) shows the dialog: "Your WinOMS database has reached its maximum size and requires an upgrade," and "You are unable to log into WinOMS at this time." Its resolution is to call WinOMS support. Find out where you stand before it happens.

To find your size, the System Requirements point to the vendor's v10 Readiness Check utility, which determines "whether your database is eligible for Microsoft SQL Express or Standard licenses." Your IT team runs it on the server, or you ask WinOMS support. SQL Server 2019 itself has extended support into January 2030, per Microsoft's SQL Server 2019 lifecycle page.

How long does the WinOMS v10 SQL conversion take, and what must happen first?

The vendor estimates about 1 hour per 10 GB of database for the conversion and server update, so a 40 GB database takes about 4 hours. That excludes workstation updates. You need free disk of at least 3 times the database size (3 to 4 times recommended), a SQL licence bought beforehand, and no WinOMS use during the window.

Worked example (use your own size):

Source: Tech Pack OL700-03, pages 7, 8, 9 and the troubleshooting section. Checked 26 October 2026.

The documented failure and rollback path is the reason a conversion window needs a quiet evening or weekend, not a lunch hour. If you are also replacing the server, the vendor asks to keep the new server's name and IP address the same as the old one where possible. For the general order of a software cutover, see our dental PMS migration cutover plan.

These are your technician's steps, not a list for the front desk. Nobody in the practice should switch off security tools on their own.

What if you are on WinOMS Hosted?

The Carestream Dental Cloud team performs Hosted conversions and updates on weekends. The Tech Pack asks the office to offer "three (3) optional weekends" and warns that "The office will not be able to use WinOMS during the update and conversion process." Your IT work is the office side: workstations, printers, signature pads and card terminals checked against the Hosted requirements.

The pre-flight sheet

Print this and fill it in before you book the date.

How do you back up WinOMS properly?

Back up WinOMS with the database stopped, never live. The vendor says WinOMS "does not support live backups as it can interfere with auto-lock features." On v10 your IT team uses the cstoolkit/backup command, which writes mdsdb.bak into a dated folder and restarts the database. Back up the whole WinOMSCS folder daily and keep a copy off-site.

That instruction is from the WinOMS MSSQL Tech Pack (OL700-03, June 2024) and the 10.1.x System Requirements, checked 26 October 2026. Advice that stops at copying the WinOMSCS Data folder comes from the Sybase-era (v9) Tech Pack; on v10 the folder copy goes alongside the stopped-database mdsdb.bak, not instead of it.

Monthly: book a test restore with WinOMS support onto a spare machine at a quiet time. The vendor warns that restoring the .bak file through SQL Server Management Studio "would not allow users to log in WinOMS" and asks offices to contact support for restores. So the test is vendor-assisted, never a do-it-yourself restore over the live database.

Quarterly: compare the size of mdsdb.bak with the SQL licence thresholds above, so an Express database never surprises you.

For the wider checklist, see our restorable dental backup checklist and our backup and disaster recovery service page. What to do if the server fails during a case is in the surgery-day downtime plan.

How much internet does WinOMS Hosted or Sensei Cloud need?

WinOMS Hosted needs 10 Mbps for 1 to 5 users, 20 Mbps for 6 to 10, 40 Mbps for 11 to 20 and more above that, with at least 2 Mbps per simultaneous user and latency of 50 ms or less. Sensei Cloud lists 10 Mbps down and 10 up as its minimum, with 25 down and 10 up recommended.

Source: WinOMS 10.1.x Hosted System Requirements, page 2; Sensei Cloud System Requirements. Checked 26 October 2026.

The Sensei Cloud document lists its speeds under the workstation and does not say whether they are per computer or per office, so ask the vendor how they scale with users. The Hosted document also warns that "Sharing bandwidth with other internet-intensive services such as video streaming or VOIP could affect WinOMS Hosted performance," and suggests imaging users consider a faster service, both download and upload.

Worked example: eight simultaneous Hosted users (example; use your own numbers):

1. 1. The vendor's band for 6 to 10 users is 20 Mbps.
2. 1. The per-user rule gives 8 × 2 Mbps = 16 Mbps, so the 20 Mbps band is the larger figure.
3. 1. Add your phone system's needs and your imaging uploads. Get both numbers from your phone and imaging vendors; there is no standard figure.
4. 1. Choose a circuit comfortably above the total, and test that latency to the Hosted service stays at 50 ms or less at busy times.
5. 1. Add a second internet line so the office is not stuck on one connection. Our guide to when the office internet goes down covers the options.

How should satellite offices and remote surgeons reach WinOMS?

On-premises WinOMS is reached over the office network or a VPN, with firewall exceptions for mdcs.exe and SQLserver.exe. Remote Desktop Services is not supported. WinOMS Hosted is reached through Citrix Workspace from each site, with the same bandwidth rule per site. Sensei Cloud runs in a supported browser.

Source: WinOMS 10.1.x System Requirements, pages 1, 2 and 7; Tech Pack OL700-03, page 6; WinOMS 10.1.x Hosted System Requirements. Checked 26 October 2026.

What not to do:

• • publish Remote Desktop to the internet so someone can reach the server from home;
• • run WinOMS over Remote Desktop Services, which the vendor does not support;
• • put the anesthesia module on Wi-Fi.

How a multi-office group connects satellites and rotating surgeons is covered in the pillar guide. For groups of ten or more offices, see our DSO IT support page.

What to ask your IT provider about a WinOMS server or cloud move

Before you replace the server or move to the cloud, ask questions that show whether someone has read the vendor's documents. Each one below comes with what a good answer sounds like. For a general list, see our 20 questions to ask before signing with a dental IT provider.

The bottom line

Decide the software first. Then size the server and the SQL licence from the current documents, book the conversion with a switch-back-on plan, and prove the backup with a vendor-assisted test restore. If Windows Server 2016 runs your WinOMS today, 12 January 2027 sets the deadline.

Legend Networking has served over 3,500 practices since 2004 and holds a 4.8 rating from 173 Google reviews. Our oral surgery IT support covers the computers, network, server, backups and accounts around the software you run; the software vendor supports the application.