Cloud Drive Mapper for accounting practices

Accountancy practices, tax firms, audit practices and payroll administrators run on a specific software layer: Sage, QuickBooks, IRIS, CCH, Thomson Reuters, Xero and the practice-management suites around them, sitting on top of a Microsoft 365 estate that has to reliably serve client-organised folders, sensitive financial documents, and the year-end and tax-season concurrency peaks that push infrastructure to its limits. Cloud Drive Mapper brings real-time Microsoft 365 file access to accounting practices without disrupting how partners, accountants, admin staff and clients work with files.

1.5M+ active users worldwide

~5,000 organisations run CDM

ISO 27001 certified since 2016

01

Full compatibility with the accounting software your practice runs on

Practice-management, accounting, tax, audit and payroll software all expect a Windows drive letter or UNC path. Sage, QuickBooks Desktop, IRIS practice suites, CCH, Thomson Reuters tools, Xero desktop connectors and the long tail of jurisdiction-specific tax software all behave the same way: they open, lock and write client data files through the file system. Migration to SharePoint has stalled in many practices because that software layer simply does not understand cloud-file semantics.

Cloud Drive Mapper presents Microsoft 365 storage as virtual network drives with real file paths. Every accounting application that expects a Z: or an S: drive gets one. Software that takes exclusive locks on client data files during batch runs (a common pattern at month-end and year-end) sees those locks honoured at the storage layer, exactly as it would against a network share. Migration to Microsoft 365 stops being blocked by application compatibility.

02

Multi-client folder structure preserved as it moves to SharePoint

Accounting practices organise everything around the client. Each client (or matter, or engagement) has a folder tree the whole practice recognises: current-year working papers, prior-year archive, tax returns, correspondence, payroll files. Partners and staff navigate that structure by muscle memory. Anything that disrupts it disrupts fee-earning work.

Cloud Drive Mapper maps SharePoint document libraries as drive letters. Whichever client-folder structure the practice has built up over the years survives the move to Microsoft 365 unchanged. Partners, accountants and admin staff open the same client folders the same way, from the same drive letters. The storage layer moves; nothing else has to.

03

Familiar drive letters that survive year-end and tax season

Accounting has hard deadlines. Year-end, quarterly filing, tax season, statutory audit windows. A file-access change that lands mid-January or mid-April will be noticed, in a bad way, by partners and clients alike. Retraining a workforce that has worked the same way for decades is not on the table while filing deadlines are pending.

Cloud Drive Mapper looks like a file server to the user. The S: drive, the T: drive, the folder tree the whole practice has been using for years: still there, still exactly where it was. Partners open working papers the way they always did. Admin staff file correspondence the way they always did. The storage behind it has moved to Microsoft 365, but the working experience did not change.

04

Retiring on-site file servers without disrupting fee-earning work

Many practices still run one or more on-site file servers as the primary store for client working papers, often because earlier attempts to migrate to SharePoint foundered on application-compatibility or user-experience issues. Cloud Drive Mapper removes both blockers. The move can happen without changing how partners, accountants or admin staff open, save or search for client files, because the drive letter stays the same.

For practice IT budgets, this matters: server hardware refresh cycles avoided, on-site backup infrastructure retired, disaster-recovery scope reduced, and one fewer thing for the practice's small IT team to look after. Once the file server is decommissioned, the SharePoint content also becomes usable by Microsoft 365 Copilot.

05

Azure Virtual Desktop, Citrix and RDP estates for sensitive client work

Many practices run AVD or Citrix to give accountants and admin staff a consistent working environment across offices and home working, and to keep sensitive client data off local endpoints. The OneDrive sync client is a persistent problem in these environments: profile bloat, non-persistent-session failures, and file access that behaves differently inside a VDI session than on a partner's own laptop.

Cloud Drive Mapper is built for the way VDI actually works. On an AVD or Citrix host, CDM is user-based: multiple users sharing one host each see their own drive mappings inside their own session, exactly matching what they see on their laptop. That single behaviour has let practices consolidate RDP tiers that had been kept alive largely to serve file access, and stop the "leave the VDI session to find the file" workflow that had been costing partner time.

06

One storage layer for your practice and your client portal

Many practices operate a client-portal model: the client gives you documents, you do the work, the client accesses the outputs. Traditionally that has meant building or licensing separate portal infrastructure alongside the practice's own file storage. Microsoft 365 lets you collapse that split.

Your staff work in SharePoint through Cloud Drive Mapper's familiar drive letters, and each client is invited to their own SharePoint site as a guest user, opening it in the browser or in Microsoft Teams. Cloud Drive Mapper is for users in your own tenant, so clients don't get mapped drives, but they see the same files your team is working on. One storage layer, one access model, guest permissions giving each client visibility of only their own workspace.

We use CDM and are very satisfied with the latest version. It's stable and our clients can access their data through our portal. Quick and simple.
Erik Hannink, AABO BV

07

Compliance-conscious data handling: tenant boundary, no persistent cache, delegated permissions

Client confidentiality is not negotiable in accounting practice. Any middleware in the file-access path has to satisfy the practice's ethical and regulatory obligations as clearly as it satisfies the IT team.

Cloud Drive Mapper's architecture is designed for that scrutiny. Content stays inside the practice's Microsoft 365 tenant boundary. There is no persistent local cache on the endpoint, so a lost or stolen laptop does not contain a residual copy of client data. IAM Cloud holds zero credentials that would authenticate to your tenant. All access is via delegated permissions in the customer tenant with a full Microsoft 365 audit trail. See the zero-access architecture solution for the technical detail suitable for professional-body sign-off.

08

No persistent files on device, for laptops that travel with partners and staff

Practice laptops travel. They go to client sites, on trains, in home offices, and (occasionally) get left behind at the coffee shop. A file-sync model that leaves gigabytes of client working papers, tax returns and correspondence on the local disk of every laptop is a data-protection problem waiting to happen.

Cloud Drive Mapper does not create a persistent local cache of files. Content is streamed from Microsoft 365 to the device at the moment a user opens it, and released when they close it. A lost or stolen device does not contain a residual copy of client data at rest. Incident response is simpler: if a laptop is compromised, there is no local client file inventory to enumerate.

09

Copilot-ready SharePoint content for practice-wide knowledge and precedent

Microsoft 365 Copilot only sees content that lives in SharePoint, OneDrive and Teams. Practice knowledge, tax rulings, precedent letters, technical guidance, staff reference material: while these live on an on-premises file server or a network drive Copilot cannot reach, they are invisible to any AI-assisted workflow the practice might build in the coming years.

Cloud Drive Mapper is what moves that content off the file server and into a place Copilot can reach, at a schedule where you retain full control over what becomes indexable when. For practices with substantial precedent and technical-knowledge estates, that is a Copilot readiness gate CDM directly unblocks.

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Frequently asked questions

Does Cloud Drive Mapper work with accounting-specific software like Sage, QuickBooks, IRIS, CCH and Xero?

Yes. CDM presents Microsoft 365 storage as virtual network drives with real file paths. Accounting software that expects a Windows drive letter or UNC path, including desktop-installed Sage products, QuickBooks Desktop, IRIS practice suites, CCH, Thomson Reuters practice tools and equivalents, sees CDM's drives as ordinary Windows file storage and works without modification. This includes applications that take exclusive locks on data files during batch runs, month-end and year-end processing.

How does Cloud Drive Mapper handle sensitive client data?

CDM streams file content from your Microsoft 365 tenant on demand and does not maintain a persistent local cache. Client data does not sit at rest on the endpoint between working sessions. Access is governed by delegated permissions inside your tenant, so a client's files are only accessible to the users your firm has granted access to. IAM Cloud holds no credentials to your tenant and has zero access to client content by design.

Can our clients access their own data through Cloud Drive Mapper?

Not through Cloud Drive Mapper itself. CDM maps drives only for users in your own Microsoft 365 tenant; it doesn't support guest users. If you run a client-portal model, you can still share SharePoint sites with clients as guest users, and they open their files in the browser or in Microsoft Teams. Your staff work on the same files through CDM's mapped drives, so you don't need separate portal infrastructure.

Can Cloud Drive Mapper handle the concurrent-access pressure of year-end and tax-season peaks?

Yes. CDM is used by firms of all sizes and its architecture (streaming from Microsoft Graph, no local sync loop, no per-endpoint cache to reconcile) scales cleanly under concurrent load. Peaks come from more users opening more files at once; CDM adds no queueing between the user and Microsoft 365 that would create artificial bottlenecks. Bandwidth per user stays proportional to files actively open.

Does IAM Cloud have access to our client data?

No. Cloud Drive Mapper operates purely with delegated permissions inside your Microsoft 365 tenant. IAM Cloud holds no credentials that would authenticate to your tenant. Only your firm's signed-in users can access content through CDM, and only within their existing M365 permissions. Full technical detail is in the Zero-access architecture solution.