List of the Top 11 Cloud Storage Services for Microsoft Outlook in 2025

Tresorit offers a highly secure solution for file sharing and synchronization, enabling users to store, sync, and share their documents from any location at any time. Utilizing end-to-end encryption, Tresorit safeguards your files against potential threats from hackers and internal data breaches. All information is stored in compliance with GDPR regulations within Microsoft Azure Data Centers located in Europe. Users have the ability to control who can edit, add, or view the files they share, and can securely access updated documents through their web browser, desktop, or mobile device. Additionally, files can be shared securely beyond your organization, allowing for a safer alternative to sending unsecured email attachments. With end-to-end encryption, your files remain encrypted until they reach the intended recipient, ensuring that only you and the recipient have access. To facilitate collaboration with external partners, Tresorit provides Content Shield features that further protect your business assets. For more information on these features, visit the Tresorit website. This robust approach not only enhances security but also fosters a collaborative environment while maintaining data integrity.

PreVeil transforms the landscape of end-to-end encryption by providing exceptional security for organizations' emails and files, shielding them from various threats such as phishing, spoofing, and business email compromise. The platform prioritizes user-friendliness, making it accessible for employees while remaining simple for administrators to manage. By implementing PreVeil, companies can utilize a secure and easy-to-navigate encrypted email and cloud storage solution that protects vital communications and documents effectively. With its advanced end-to-end encryption, PreVeil guarantees that data is safeguarded at every stage of its lifecycle. Moreover, the platform includes a feature known as the “Trusted Community,” which promotes secure interactions among employees, contractors, vendors, and other external entities. This groundbreaking addition enables users to exchange sensitive materials with confidence, assured that they are shielded from prevalent cyber threats. Ultimately, PreVeil not only enhances security for organizations but also cultivates a cooperative atmosphere that encourages teamwork and collaboration among its users. By prioritizing both safety and usability, PreVeil addresses the evolving needs of modern businesses.

OwnCloud serves as an open-source platform designed for collaborative content management, enabling teams to seamlessly share and work on files from any device, regardless of their physical location. With over 100 million users globally, it stands out as a viable alternative to public cloud services, empowering individuals and organizations to prioritize their digital sovereignty, enhance security, and ensure robust data protection. Furthermore, its flexibility and user-friendly interface make it an appealing choice for diverse groups looking to manage their files effectively.

The Barracuda Cloud Archiving Service provides a robust cloud archiving solution designed to help organizations meet strict compliance requirements while effectively managing e-discovery inquiries. It integrates seamlessly with platforms such as Office 365 and G Suite, utilizing Barracuda’s Cloud to store data indefinitely, thereby ensuring that the information remains preserved and unchanged. By enabling users to access all messages sent or received from any device, it significantly boosts productivity across the board. This service works harmoniously with various email systems, including Office 365 and Exchange, offering a comprehensive cloud archive without the need for additional hardware or software investments from users. Additionally, the service features a flexible Outlook add-in, mobile applications for both iOS and Android, and a user-friendly web interface that streamlines the retrieval and restoration of messages, including those deleted from the mail server. Consequently, the Barracuda Cloud Archiving Service not only makes compliance easier but also provides users with exceptional access to their entire communication history, ensuring that vital information is always at their fingertips. This level of accessibility fosters greater collaboration and enhances organizational efficiency.

This innovative product integrates three crucial functionalities: seamless file synchronization and sharing, continuous real-time backup, and comprehensive antivirus protection that includes defenses against ransomware. Users have the ability to effortlessly save, sync, and access the most updated versions of their files across multiple devices, benefiting from unlimited versioning capabilities that enhance flexibility. Furthermore, it facilitates instant file restoration from cloud storage, desktops, and mobile devices, which is essential for quick recovery. To counteract the threat of ransomware attacks, it incorporates advanced anti-malware and antivirus solutions powered by Bitdefender, ensuring robust security. Users can easily protect against compromised passwords through two-factor authentication, which is conveniently managed via the HostPilot control panel. Both newcomers and existing SecuriSync users have access to Bitdefender's top-tier security features without any extra charges. The added layer of security from two-factor authentication enhances protection for administrators, while the ongoing real-time backups ensure that all files, including those from PCs and mobile devices, remain secure. With the capability to restore files to any prior version with a single click, users can confidently safeguard their data, making it readily recoverable from ransomware threats, thereby significantly enhancing their peace of mind and overall data security. Additionally, this feature-rich solution empowers users to focus on their work without the constant worry of potential data loss.

FileCloud is a hyper-secure EFSS (enterprise file sync and share) platform providing industry leading compliance, data governance, data leak protection, data retention and digital rights management capabilities. FileCloud is a leader in content governance and collaboration for unstructured data, trusted and used worldwide across Global 1000 enterprises, educational institutions, government organizations, and service providers. Granular control of content sharing is fully integrated into the stack through comprehensive audit logs and access permissions, and the Compliance Center helps with regulations like GDPR, HIPAA, and NIST 800-171 (among others). FileCloud also provides Zero Trust File Sharing® an industry first innovation that allows users to share sensitive data via an encrypted zip file that cannot be accessed by unauthorized users, even in the event of a data breach. FileCloud helps customers solve complex challenges in enterprise file sharing, privacy, compliance automation and governance across public, private, and hybrid cloud environments. In addition to its enterprise file sharing solution, FileCloud’s product portfolio also includes Signority (acquired in May 2024), a Canadian-based e-signature and document workflow platform.

A collaborative software solution designed for both service providers and enterprises, enhanced by mobile applications. This personalized cloud platform merges collaborative tools, file storage, and email functionalities into a single ecosystem. Featuring a sleek and contemporary interface, it is compatible with your current mail server or can operate independently. With dedicated iOS and Android applications for Email and Files, users can effortlessly log in using just their email and password, eliminating the hassle of navigating blocked IMAP/SMTP ports or complex mail server configurations. Additionally, it supports integration with LDAP for authentication, LDAP address book access, and OAuth 2.0, allowing seamless connections to resources such as Google Drive or Dropbox. This all-in-one solution simplifies collaboration and enhances productivity for users across various devices.

At vBoxx, we prioritize excellence in hosting and cloud infrastructure, guaranteeing outstanding performance and steadfast reliability for our clients. Our services are fully compliant with AVG regulations, and we offer tailored support as a fundamental aspect of our operations. Recognized for our prompt and trustworthy assistance, we are located in The Hague, where every client is paired with a dedicated contact person to facilitate communication and avoid the need to reiterate their concerns. We offer several effective methods for reaching out to us, such as live chat and direct phone lines, making it convenient for you to connect with your assigned representative. Acknowledging the vital importance of servers in your operations, we provide the flexibility to customize your own dedicated or virtual private server to meet your unique requirements. Enjoy a completely dedicated environment purpose-built for your business, guaranteed to maintain a 99.9% uptime. Our secure cloud storage options, based in the Netherlands, ensure that your company's data is reliably safeguarded while allowing for effortless file sharing with both internal teams and external partners, all while maintaining control over your information. With vBoxx, you can be confident that your organization's digital requirements are addressed with the utmost quality of service and security, creating a solid foundation for your business's success. You can trust that we are committed to enhancing your experience and supporting your growth every step of the way.

DoubleClue, created by HWS Group in Bavaria, acts as a comprehensive Identity and Access Management solution aimed at managing identities, permissions, and access rights. It enhances corporate networks' defenses against cyber threats targeting digital identities, often referred to as the "human factor," by utilizing sophisticated multi-factor authentication techniques. The platform also features an extensive password management system along with secure cloud storage for handling sensitive data. With a strong emphasis on identity protection, password safety, and cloud security, all backed by adaptive multi-factor authentication (MFA), DoubleClue can be implemented either on-premises or within a cloud environment. This cutting-edge solution tackles a vital aspect of business security that traditional firewalls and antivirus programs frequently neglect—the human element, which is often the weakest link in IT security. By leveraging a comprehensive all-in-one platform, organizations can secure all digital accesses, applications, passwords, and confidential information effectively. In the modern digital workspace, where employees demand greater flexibility, DoubleClue enables them to work from any location and across multiple devices without compromising their IT security. Moreover, this level of adaptability is essential as remote work continues to gain traction in various industries. Ultimately, DoubleClue not only safeguards corporate assets but also fosters a secure environment for a dynamic workforce.

Our cloud and hosting solutions designed to meet HIPAA standards are perfectly tailored for healthcare providers and organizations in need of dependable and secure options for cloud and website hosting. At HIPAA Vault, we pride ourselves on our managed services that promise response times of less than 15 minutes for urgent alerts, along with an impressive first call resolution rate of 90%. Our dedicated team of IT professionals is equipped to handle a diverse range of requirements, from basic support and maintenance to complex issues such as advanced firewall configurations and thorough system monitoring. This comprehensive approach not only helps reduce operating expenses but also ensures you stay up-to-date with the latest security measures and regulatory requirements. For clients needing a Windows environment, our HIPAA Compliant Windows Hosting plan represents an outstanding option for peace of mind. Furthermore, we offer customized HIPAA-compliant email messaging solutions that align with your business needs, providing security, convenience, and flexibility across all operational facets. By opting for our services, you are making a significant investment in a strong infrastructure that emphasizes both compliance and operational efficiency, ultimately fostering a secure environment for your healthcare data. Recognizing the unique challenges faced by the healthcare sector, we continuously strive to enhance our offerings to ensure our clients receive unparalleled support.

KeepItSafe provides a comprehensive suite of Data Protection-as-a-Service solutions designed to guarantee data availability through methods like cloud backup, disaster recovery, mobile endpoint management, and support for various SaaS applications. With a robust network of over 20 data centers globally, KeepItSafe complies with rigorous standards including SOC 2, HIPAA, and PCI, while offering customized managed services and continuous support. Renowned for its security and scalability, the company’s cloud backup and on-demand recovery services include Backup-as-a-Service (BaaS), which features thorough monitoring and 24/7 support for users. Serving as a complete disaster recovery and online backup provider, KeepItSafe presents fully managed Disaster Recovery as a Service (DRaaS) that protects and replicates data across multiple secure off-site servers, ensuring swift failover during critical incidents. Furthermore, their advanced endpoint backup solution enhances file sharing, teamwork, and data-loss prevention, all seamlessly integrated into a single platform. KeepItSafe Mobile equips IT managers with essential tools to protect their organizations against unforeseen data crises, significantly contributing to effective data management. In a landscape where data security is paramount, KeepItSafe stands out as a trusted ally for businesses aiming to fortify their data infrastructure.