Act! Premium Cloud (also Act! Advantage and Act! CRM Classic)

• Browser: Google Chrome (Windows and Mac), Microsoft Edge v79+, Apple Safari 17.6+ (macOS)
• Computer: 4 GB RAM, 1.8 GHz processor, 1024 × 768 monitor or higher
• Internet: broadband with at least 100 Mbps download and 20 Mbps upload — Desktop Sync needs low latency, satellite internet is not suitable
• Office integration: Microsoft Office 2016, 2019 and 2021 (32- and 64-bit); Exchange and Microsoft 365 for contact and calendar sync
• Mobile: Apple iOS and Google Android

Act! Premium v27 — desktop (Windows)

• Operating system: Windows 11 (64-bit) or Windows Server 2016, 2019, 2022, 2025
• Hardware: 4 GB RAM, 1.8 GHz processor, 4 GB free disk space
• Database: SQL Server 2022 Express (included) — x64 Intel or AMD processors only, no ARM devices
• Runtime: .NET Framework 4.8
• Office integration: Office 2016, 2019, 2021 (32- and 64-bit); Exchange and Microsoft 365

Act! Premium v27 — web (your own server)

• Server: Windows Server 2016 to 2025 or Windows 11 (64-bit), 4 GB RAM, 4 GB disk space, .NET Framework 4.8
• Database: SQL Server 2022 Express, x64 Intel or AMD processors
• Access: in the browser — Chrome, Edge v79+, Safari 17.6+; mobile via iOS and Android

As of 15 Sep 2026 — the official overview on act.com is authoritative. Whether your environment fits is what the free first call is for.