Send large filesstraight from Outlook.No 25 MB limit.
Microsoft 365 caps email attachments at 25 MB. OneDrive forces recipients to log in with Microsoft. ZIP splitters are embarrassing. With SecureFiles you send files of any size right from Outlook, encrypted, without login requirements for recipients, without a new interface.
The problem is well known. The three common workarounds are all worse than the disease.
Microsoft 365 blocks attachments above 25 MB. No matter how big your mailbox is, the Exchange transport service caps.
External recipients need a Microsoft account or fail the permission check. Customers without a Microsoft environment are locked out.
Split a file into 20 parts, send by email, have the recipient reassemble, a workflow from 1998. And the recipient-side virus scan often blocks the first part.
Caches in the US, no E2E encryption. Unsuitable for client, patient, or personnel data.
You keep working in Outlook as usual, subject line, attachments, signature. SecureFiles detects attachments that are too large or sensitive and silently replaces them with an encrypted link including expiry and optional password.
Works in classic Outlook, new Outlook, and Outlook on the Web.
Recipients need no account, no Microsoft login, no new app.
No fixed size cap. CAD, video, database dumps, it all ships.
SecureFiles fits seamlessly into your existing Outlook flow. No second tool, no context switch.
One-time rollout central via Microsoft 365 Admin Center. End users install nothing. Classic, New, and Web Outlook supported.
Compose the email, open the add-in, add the file, send. One click replaces the attachment with an encrypted link.
The file is uploaded encrypted to SecureFiles infrastructure in the EU, the attachment is replaced with a signed link. Recipient clicks, download. No Microsoft account, no software.
No tool switch, no training, no GDPR risk, on the contrary: more security than native Outlook attachments.
Enterprise tier supports single attachments of virtually any size. CAD, video editing, database dumps, all work.
COM add-in for Classic Outlook, Office add-in for New Outlook and Outlook on the Web. One add-in, three clients.
Roll out to all employees via Microsoft 365 Admin Center. No end-user installation, no training.
The recipient needs nothing but the link in your email. No Microsoft, no Dropbox, no Tresorit.
Optional zero-knowledge with client-side key, more secure than a normal email attachment would be anyway.
Every upload is scanned before release. Audit log shows download events, IP hash, timestamp. GDPR Art. 30 ready.
Which approach actually scales, for enterprise use.
SecureFiles add-in | Typical workarounds | |
|---|---|---|
| Max. attachment size | No fixed size cap | 25 MB (Outlook native) |
| Login for recipient | Not required | OneDrive: Microsoft account usually required |
| GDPR hosting | EU jurisdiction | OneDrive: US hoster / WeTransfer: US caching |
| End-to-end encryption | Optional zero-knowledge | TLS only |
| Virus scan during transfer | Malware scan standard | Not documented |
| Admin rollout | Centrally via M365 Admin Center | End-user installation required |
| Audit log | Included, GDPR Art. 30 | OneDrive: limited / WeTransfer: hardly any |
As of 2026. Comparison statements about third-party vendors are based on publicly available sources at publication time. Without warranty of continued accuracy.
DSGVO-konformer Dateiversand aus der EU, ohne CLOUD-Act-Risiko.
Modulare deutsche Alternative mit echtem Zero-Knowledge.
Sicherer Dateitransfer statt FTP — Outlook-Add-in, Audit-Log, NIS-2.
Verschlüsselter Dateiversand nach Art. 32 DSGVO und NIS-2.
Dateien sicher empfangen — persönlicher Upload-Link für Externe.
30-day free pilot. Outlook add-in rolled out in an hour.
Policy engine replaces automatically above a defined size or for classified data.