ContactOffice

ContactOffice is an online workspace combining mail, calendars, address books, files, and collaboration. It suits individuals and work groups that want one account to cover those jobs while still connecting to established desktop and mobile protocols. Its broad integration range is useful, but modest storage ceilings and paid-only global synchronization make the paid tiers more practical for serious use.

For light personal coordination, the free account can be sufficient. Teams and users with larger archives should budget for a subscription and check the mailbox, document, and address-book quotas before moving existing data.

Overview

ContactOffice brings communication and organization into a single service rather than requiring separate mail, calendar, contacts, and file products. It supports web access across major desktop and mobile platforms, and its compatibility with POP3, IMAP, SMTP, CalDAV, CardDAV, WebDAV, and SMB/CIFS helps it fit mixed software environments.

The service is hosted in Europe, with TLS/SSL-protected transfers, two-factor authentication, managed backups, and a stated 99.8% accessibility service level. Individual access rights apply to each item, with private data restricted to the account owner by default. Users can export their data in standard formats when leaving, which reduces lock-in.

Key features

Mail, calendars, and contacts

The messaging center can combine POP3, IMAP, Gmail, and Yahoo accounts. POP3/IMAP software access and SMTP relay make it workable with conventional mail clients rather than only a browser. Shared agendas, invitations, polls, reminders, and CalDAV synchronization support group scheduling, while contacts can store photos, comments, instant-messaging addresses, and maps. CSV and vCard import plus CardDAV synchronization are helpful when bringing an existing address book into the service.

Documents and collaboration

The documents area provides shared files, collaborative editing, PDF conversion, and WebDAV access. Listed compatibility with Dropbox, Google Drive, Outlook, Apple Mail, Thunderbird, Gmail, Yahoo, WebDAV, SMB/CIFS, CalDAV, and CardDAV broadens its role as a hub for established tools. The maximum stated capacity is 0.009 TB, so it is better for working files and moderate archives than for a large media or document library.

Mobile and synchronization

Synchronization covers iPhone, iPad, Android, and other Exchange-capable devices. That device breadth is a strength for households and distributed groups, but global synchronization is restricted to paid subscriptions; users who need every device updated automatically should not plan around the free tier.

Pricing

ContactOffice uses a freemium model. The Free plan costs nothing and includes a 500 MB mailbox, 500 MB of documents, 200 address-book entries, and 0 SMS/month. It is suitable for a small personal account or a trial of the workspace, but the storage and contact limits arrive quickly.

Light costs €5 a month, billed 6 months, with 5 GB of mailbox space, 3 GB of documents, 2,000 address-book entries, and 10 SMS/month. It is the sensible step up for an individual who needs paid synchronization without large quotas.

Regular costs €10 a month, billed 3 months, and raises capacity to 10 GB of mail, 4 GB of documents, 3,000 contacts, and 20 SMS/month. Advanced costs €20 a month, billed 3 months, providing 15 GB of mail, 5 GB of documents, 5,000 contacts, and 30 SMS/month. These tiers fit heavier personal or group use, though even Advanced remains limited for extensive archives. The published paid entry point is €5/user/mo; plans without a separately stated seat arrangement should be evaluated against the number of accounts required.

Platforms

ContactOffice runs on the web and supports Android, iOS, Linux, macOS, and Windows. Exchange-capable devices, standard mail protocols, CalDAV, CardDAV, WebDAV, and SMB/CIFS make it adaptable across operating systems and existing software.

Who it's for

Choose it for a personal setup or work group that values one European-hosted workspace for communication, scheduling, contacts, and shared documents. It is less suitable for organizations needing very large storage quotas or free, account-wide synchronization across devices.

Pros and cons

Pros

• Combines email, calendars, contacts, and collaborative documents in one workspace, reducing the need to connect separate services.
• Broad protocol support, including POP3/IMAP, SMTP, CalDAV, CardDAV, WebDAV, and SMB/CIFS, helps it coexist with established clients and storage systems.
• European hosting, encrypted transfers, two-factor authentication, item-level permissions, backups, and data export address security and portability concerns.
• Runs on web, Android, iOS, Linux, macOS, and Windows, with synchronization for Exchange-capable devices.

Cons

• The Free plan allows only 500 MB each for mail and documents and 200 contacts, making it a short-term or light-use option.
• Advanced tops out at 15 GB of mailbox space and 5 GB of documents, which can constrain large archives.
• Global synchronization requires a paid subscription, reducing the free plan's usefulness across multiple devices.
• Paid plans use six-month or three-month billing terms, so the listed monthly rate is not a month-to-month commitment.

Alternatives

Collaborative Document Software is the broader category to browse when shared editing is the primary requirement rather than an all-in-one mail and contacts workspace.

AppFlowy is a freemium option spanning desktop, mobile, web, API, and self-hosted deployments, making it a better direction for teams or enterprises wanting deployment flexibility.

Lark offers a free Starter plan for 20 users with 100 GB storage, 18 months of message history, and 1,000 automations per month, so it is worth considering for a larger collaboration workspace.

Nuclino has a free tier limited to 50 items, three canvases, and 2 GB total storage, fitting a smaller knowledge-work collection rather than ContactOffice's mail-centered bundle.

Tencent Meeting & VooV Meeting is oriented toward online meetings, with a free edition supporting up to 300 participants per meeting.

WPS Docs provides a free 1 GB cloud tier, broad file-format support, and basic PDF features for document-focused users.

Collabora Online offers a free on-premise development edition for testing and home use, which better suits self-hosting than a managed workspace.

Craft is a freemium document workspace with a free plan capped at 1,500 blocks and 1 GB storage.

Hancom Docs has a free 2 GB plan with web and mobile Hancom Office access, making it a document-suite alternative rather than a mail-and-calendar hub.

Verdict

ContactOffice is a strong fit for individuals and work groups that want European-hosted email, scheduling, contacts, and shared files with extensive protocol compatibility. Choose it primarily for that integrated, standards-friendly workspace; look elsewhere if you need generous storage or global synchronization without paying.