Nextcloud Outlook integration

Automatically upload files to replace large attachments or integrate Calendars and Contacts in Microsoft Outlook

Secure File Sharing by email

The Sendent Outlook Add-in enables Nextcloud customers to easily and securely send files, folders or upload links to others from within Microsoft Outlook.

The Add-in can replace attachments, automatically uploading files to Nextcloud and insert a secure link in the email. It also makes it easy for users to provide others with a secure file upload link.

Secure data and lower costs

The Sendent Outlook Add-in takes away the IT headache caused by risky attachments.

Storing and sharing files securely through Nextcloud ensures company policies on data availability, retention and safety can be enforced. This enables system administrators for example to make sure attachments are run through the virus scanner, certain file types are protected from being shared outside the company or that retention policies are followed.

Another significant advantage for IT departments is the savings in storage space for email servers. The add-in negates the need for storing large amounts of attachments in multiple email boxes and decreases network traffic.

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Key benefits

  • Keep inbox growth under control
  • Sent files of any size
  • Easily share file upload links
  • Protect the content and attachments of mails with Secure Mail
  • Use File Access Control to limit access by unauthorized users
  • Use Workflow to automatically remove attachments after a set time


The Sendent Outlook Add-in turns email attachments into Nextcloud links, manually or automatically. It can insert upload links where the recipient of the email can upload files to. Users can add passwords and expiration dates, the admin can enforce these settings if needed.

New users can enjoy the user-friendly setup dialog to get going, and the Upload Files / Share Public Folder option is directly available in the ‘message’ tab.

The Add-in can be configured to automatically upload all attachments the user added to an email starting from a configurable size, for example, all files over 200kb.

Users can also use the easy file selection dialog to insert links to files on their Nextcloud storage.

Secure Mail

The Secure Mail feature protects the content as well as attachments from emails. It uploads the email body and can automatically create guest accounts for recipients. With account protections like 2-factor authentication, brute-force protection and suspicious login detection, this provides the level of security that banks, notaries or hospitals need to exchange confidential information with their clients or patients.

Other features:

  • Users can pick files from the local desktop or from the Nextcloud server
  • Activity tracker notifies sender about file uploads/downloads
  • App follows server policy enforcement options
  • App features customizable upload path
  • Domain whitelisting
  • Multi Language support
  • Branding
  • Server app for configuration

The add-in works with Microsoft Outlook 2010, 2013, 2016 and 365 for Windows.

Uploading files

Setting a password

Configuration in the Nextcloud app

Feature highlight

Secure Mail

The Sendent Outlook Add-in includes a secure mailbox feature. This feature protects the contents (body) of email from interception by providing the recipient with a notification that a new email was received. The recipient then has to log in on their (guest) account to access the email and its attachments.

The body of the email is shown with the file attachments. Each email is a folder, linked to in the email notification.

In the screenshots below, the user sends the link and password to the recipient by email. The user can take out the password and send it through another channel. Alternatively, when a guest account is set up for the recipient, the Outlook add-in will detect this and instead share the message to the guest account and include an internal link in the email. The recipient will have to log into their guest account to access the email.

Email as it will be sent to recipient

Recipient view in Secure Mail in Nextcloud

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Free for home users

Nextcloud strives to provide private cloud solution for everyone so we worked with our partner to provide a free version of the Secure Outlook Add-in. Note that the free version is only meant for home users and small organizations and lacks many of the features of the enterprise version.

The free Secure Outlook Add-in features the core capabilities: sharing from your Nextcloud instance instead of sending insecure large attachments, with an optional expiration date. Branding is limited and some other features for enterprise usage are not included.

Pricing for the Sendent Outlook Add-in starts at €6,48 per user per year with discounts for larger user numbers.

Request a quote

Mozilla Thunderbird

Users of Mozilla Thunderbird will be delighted to hear that there is a Thunderbird Filelink Addon!

This Thunderbird extension makes it easy to send large attachments with Thunderbird by automatically uploading them first to a Nextcloud server and by then inserting the link into the body of your email.

Sync Calendars and Contacts

With the Outlook CalDav Synchronizer integration with Nextcloud,
Outlook users can easily sync their events, tasks and contacts
between Microsoft Outlook and their Nextcloud server.

What it does

The CalDAV and CardDAV plugin offers two-way sync for CalDAV calendars and tasks, CardDAV contacts and can also handle the Google native Contacts and Tasks API.

The plugin handles Outlook categories, mapping CalDAV server colors to Outlook category colors and syncing calendars and tasks to the categories. The plugin also handles time zones and recurring events with exceptions and can deal with Outlook custom properties.


The Outlook CalDav Synchronizer supports:

  • SSL/TLS, also with self-signed certificates and proxy
  • Auto discovery of calendars and address books
  • Configurable sync time range filter
  • Time-triggered-sync and sync changes from Outlook immediately
  • And it can use server settings from an Outlook IMAP/POP3 account profile.
Learn more

Mozilla Thunderbird

Thanks to the Mozilla Thunderbird Lightning Calendar add-in and the Cardbook Thunderbird Contacts add-in, Nextcloud Groupware integrates great into Thunderbird.

Learn more in our documentation.