When an employee leaves a company, most businesses focus on the obvious things first.
Collect the laptop. Turn in the keys. Remove them from payroll. Maybe have an awkward goodbye cake in the break room that nobody really touches.
But one of the biggest risks often gets overlooked entirely:
Their access to your systems.
And in today’s business environment, that access can include far more than just email.
Most businesses use dozens of connected systems every day.
Microsoft 365, Teams, SharePoint, cloud storage, accounting software, CRM platforms, remote access tools, and internal applications are all tied together behind the scenes.
The problem is that removing someone from one system does not always remove them from everything.
A former employee may still have access to company email, shared files, customer databases, cloud applications connected to Microsoft 365, or even remote access tools that allow them into internal systems.
Sometimes this happens because offboarding processes are rushed. Other times, nobody realizes how many systems were connected in the first place.
Either way, leftover access creates risk.
When people hear “insider threat,” they often picture a disgruntled employee intentionally stealing data.
That can happen. But more often, the risks are much less dramatic—and still very damaging.
A former employee may still receive confidential emails because forwarding rules were never disabled. An old Microsoft 365 account might remain active with a weak password. Shared links to sensitive files may continue working long after someone leaves the company.
In some cases, attackers target former employee accounts specifically because businesses tend to forget about them.
Unused accounts are often poorly monitored, rarely updated, and less likely to trigger immediate suspicion.
Microsoft 365 is built for flexibility and collaboration.
Employees can work from anywhere, access files remotely, and share information quickly. That convenience is incredibly useful for businesses. It also means account management matters more than ever.
If a former employee still has access to Microsoft 365, they may still be able to view old emails, download shared documents, access Teams conversations, or sync company files to personal devices.
Even if there is no malicious intent, that level of access creates unnecessary exposure.
This is why businesses need clear offboarding procedures instead of relying on someone to “remember to disable the account later.”
Many businesses simply do not know who still has access to what.
Over time, permissions pile up. Employees change roles. Temporary access becomes permanent. Old vendors stay connected. Former staff accounts remain active because nobody wants to accidentally delete something important.
The result is what cybersecurity professionals call “permission sprawl.”
In plain English: too many people have access to too many things.
That becomes especially dangerous during employee turnover because every forgotten account creates another possible entry point for attackers.
Most companies treat employee departures primarily as an HR process.
Cybersecurity says it should also be treated as a security event. A proper offboarding process should include disabling Microsoft 365 accounts immediately, revoking access to connected cloud applications, removing remote access permissions, reviewing file-sharing settings, and verifying multi-factor authentication access is disconnected.
The goal is not distrust. It is control and visibility.
Businesses should always know who has access, what they can access, and whether that access is still necessary.
One of the most valuable parts of a cybersecurity audit is visibility.
A proper review can identify old accounts that were never disabled, employees with excessive permissions, risky Microsoft 365 settings, and file-sharing configurations that create unnecessary exposure.
DaZZee’s Fortify IT service includes ongoing Microsoft 365 auditing and hardening designed to help businesses identify these types of risks before they become security incidents.
Because the most dangerous security gaps are often the ones nobody realizes exist.
Cybersecurity is not only about firewalls and antivirus software anymore.
Sometimes it is about having reliable processes for ordinary business moments—like an employee leaving the company.
Businesses that manage access carefully reduce risk, improve visibility, and make it much harder for attackers to exploit forgotten accounts.
And in many cases, fixing these problems is far simpler than recovering from the damage they can cause later.
If your business has not reviewed user access recently, there is a good chance more people still have access than you realize.
DaZZee helps businesses strengthen Microsoft 365 security, review user permissions, and reduce cybersecurity risk through its Fortify IT service.
Schedule a consultation with DaZZee to identify hidden access risks and make sure former employees are not leaving security gaps behind.