Professional services firms hold a large amount of sensitive client information. That might include financial records, contracts, employee details, legal documents, commercial plans, payroll data, recruitment information or confidential business correspondence.
Because that information is central to how the firm operates, protecting it is not just an IT issue. It is part of maintaining client trust, meeting data protection responsibilities and keeping the business running if something goes wrong.
The good news is that improving cyber security does not always mean adding more tools, more complexity or more disruption. For many firms, the biggest improvements come from getting the basics right and making sure existing systems, especially Microsoft 365, are configured properly.
Why professional services firms need to take client data seriously
Accountants, solicitors, consultants, recruiters and other professional services firms are trusted with information that clients would not want exposed, lost or accessed by the wrong person. Even a small security issue can create significant disruption, particularly if it affects email, documents, client files or access to key systems.
Under UK data protection law, organisations are expected to process personal data securely and put appropriate technical and organisational measures in place. The ICO also highlights the importance of confidentiality, integrity and availability, including the ability to restore access to personal data in a timely manner after a physical or technical incident.
In practical terms, that means firms need to know who can access client data, how those accounts are protected, whether devices are managed, what happens when someone leaves, and how quickly data could be recovered if it was deleted, encrypted or lost.
Small IT gaps can create bigger risks
Most cyber security weaknesses do not start with one major failure. They often build up from everyday gaps that are easy to miss when people are busy:
- Old user accounts that were not disabled when someone left.
- Weak or reused passwords.
- Missing multi-factor authentication.
- Unmanaged laptops, phones or tablets accessing company data.
- Too many people with access to sensitive folders.
- Shared mailboxes or generic accounts without clear ownership.
- Out-of-date software and unpatched devices.
- Backups that have not been tested properly.
- Unclear processes for reporting suspicious emails or security concerns.
None of these issues are unusual. In many SMEs, they appear because the business has grown, changed provider, introduced hybrid working, or added systems over time. The risk is that they are rarely reviewed together.
Microsoft 365 is often the best place to start
For many professional services firms, Microsoft 365 is the central place where client data, email, documents, Teams conversations and shared files are stored and accessed. That makes it one of the most important areas to review.
Microsoft provides several security features that can help protect user accounts and reduce common risks. Security defaults in Microsoft Entra ID, for example, are designed to help protect organisations against identity-related attacks by requiring multi-factor authentication, blocking legacy authentication and protecting privileged activities.
However, having Microsoft 365 does not automatically mean everything is configured in the right way for your business. Settings, licences, permissions, backup requirements and user processes still need to be reviewed against how the firm actually works.
What should a client data security review include?
A practical review should focus on the areas most likely to reduce risk without making day-to-day work harder. At Citadel, that would usually include looking at:
- User access: who has access to email, files, systems and client information.
- Multi-factor authentication: whether MFA is in place and applied consistently.
- Joiners, movers and leavers: how quickly access is created, changed or removed when people move role or leave.
- Device security: whether laptops, desktops, mobiles and tablets are managed, updated and protected.
- File permissions: whether sensitive folders are only available to the people who need them.
- Email security: how the firm reduces the risk of phishing, suspicious links and compromised accounts.
- Backup and recovery: whether important data can be restored quickly if it is deleted, corrupted or affected by ransomware.
- Security awareness: whether staff know what to look out for and how to report concerns.
The aim is to give the firm a clear, practical view of where the main risks are and what should be prioritised. Not every recommendation needs to be expensive or disruptive. Often, the first step is making better use of the tools and licences already in place.
Cyber security should support the way your team works
Security controls only work properly if they fit the way people work. Professional services firms often need to support hybrid working, client meetings, shared projects, confidential files, time-sensitive work and access from different locations.
That means cyber security should not simply be about locking everything down. It should be about making sure the right people can access the right information securely, while reducing unnecessary exposure.
For example, a partner may need secure access to client documents while travelling. A recruiter may need to share candidate information safely. A consultant may need to collaborate with clients through Teams or SharePoint. In each case, the setup needs to balance usability, security and control.
How Citadel can help
Citadel helps professional services firms review and improve the way client data is protected across Microsoft 365, devices, backups and day-to-day IT processes.
We can help identify obvious gaps, explain what the risks mean in plain English and suggest practical improvements that fit the size and needs of your business.
If you are not sure whether your current setup is protecting client data properly, a short review can give you a clearer view of where you stand and what should be tightened first.
To start the conversation, get in touch with Citadel and ask for a no-obligation client data and cyber security review.