CtrlShift IT Services provides managed IT services for Thornhill professional practices — accounting and tax firms, single-site law and notary offices, and medical and dental clinics in shared plazas around Promenade, Yonge, Bathurst, and Centre Street. As a managed service provider Thornhill owners trust, we focus on the things that quietly hurt small offices: Microsoft 365 security drift, plaza-shared Wi-Fi, and the onboarding/offboarding gaps that leave ex-staff and contractors with active accounts long after they have moved on.
Our technicians support Thornhill offices on both the Vaughan and Markham sides — around Promenade Shopping Centre, along the Yonge Street corridor, the Bathurst / Centre Street stretch, and the shared business plazas around Steeles. Most clients are small accounting, legal, and medical practices with 5–25 staff that need their Wi-Fi, Microsoft 365, and onboarding/offboarding to just work.
Microsoft 365 security baseline — MFA, conditional access, admin-role separation
Plaza Wi-Fi cleanup with separated staff, guest, and POS traffic
Documented onboarding and offboarding for accounting, legal, and clinic practices
Helpdesk for Outlook, password, MFA, and printer issues that keep coming back
Backup readiness for Microsoft 365 mailboxes, OneDrive, and SharePoint
Practical patch management and endpoint hygiene for small Thornhill offices
Thornhill practices cluster in three areas: Promenade and the surrounding plazas, the Yonge Street corridor up from Steeles, and the Bathurst / Centre Street stretch where most accounting, legal, and dental offices sit. We tune Microsoft 365 security, plaza Wi-Fi, and onboarding/offboarding around what those offices actually run — not the corporate-headquarters IT that bigger MSPs over-engineer for them.
Most Thornhill tenants we inherit have no MFA, no conditional access, and an admin role attached to a regular user mailbox. We baseline security in stages so a 10-person practice gets the protection without the disruption.
Locums, contract accountants, and former staff routinely keep access to shared mailboxes and SharePoint folders for months. We replace the verbal handover with a written checklist that runs the same day someone leaves.
Thornhill is a city of small professional practices, not big corporate offices. Accounting and tax firms around Promenade, single-site law and notary offices along the Bathurst / Centre Street corridor, and family medical and dental clinics in shared plazas around Steeles all share the same risk profile: a Microsoft 365 tenant set up years ago without proper security, plaza Wi-Fi that nobody owns end-to-end, and onboarding/offboarding that lives in someone's head instead of in a checklist. CtrlShift IT Services focuses on those three things first because they are where Thornhill practices actually get hurt.
Example: a small accounting or legal practice off Yonge in Thornhill — five-or-so staff plus seasonal contractors — often inherits a Microsoft 365 tenant set up years ago without MFA and with the admin role attached to a regular user mailbox. CtrlShift IT Services would typically start by separating the admin account, enforcing MFA, and adding a one-page onboarding/offboarding checklist the practice can run every time a contractor finishes.
Book a free IT assessment — no cost, no commitment. A senior engineer will review your setup and flag what actually needs attention.
FAQ
What York Region offices ask us most about ongoing managed IT. Don't see your question? Ask on the assessment call.
Most Thornhill practices fit our Essential tier at around $99/user, with the Standard plan at $129/user adding priority response when the practice grows past one location. Pricing is per user and month-to-month, with volume pricing for teams of 25+, and Huntress endpoint protection is included so you do not pay separately for antivirus. We deliberately keep the plan simple because most Thornhill clients do not have the time to manage a complicated IT bill.
Yes — and this is usually the first thing we fix. Most Microsoft 365 tenants we inherit in Thornhill were set up years ago without MFA, without conditional access, and with the admin role attached to a regular user mailbox. We separate admin roles, enforce MFA, restrict legacy authentication, and add conditional access policies sized for a 5–25 person practice — without breaking how staff actually log in.
Yes. We separate your staff network from the plaza-shared circuit, put guests on their own SSID, and lock the staff Wi-Fi to your business devices so neighbouring tenants cannot accidentally land on your subnet. Where the building only offers a shared circuit, we add a small business-grade firewall so your office is not depending on the plaza router for security.
We build a documented offboarding checklist for the practice — Microsoft 365 account, shared mailboxes, SharePoint sites, MFA tokens, line-of-business apps, and any clinic or accounting software — and run it the same day someone leaves. New hires get the same checklist in reverse, so a locum dentist or a contract accountant has access on day one and loses it on the day the engagement ends.
Yes — most of our Thornhill clients are 5 to 25 staff with no in-house technology team. We act as the IT department: one phone number, one ticket queue, one quarterly review where we walk the office owner through what changed, what is at risk, and what we are going to fix next.
Yes. The first 30 days are usually a documentation pass — we map the cabling, the access points, the Microsoft 365 tenant, the line-of-business apps, the printers, and the vendor logins — then we hand the practice owner a written summary so the next IT change is faster and safer than the last one was.