System Requirements
| OS (64Bit) | Windows Server 2016 Windows Server 2019 Windows Server 2022 |
| Hardware | Processor: minimum dual core RAM: minimum 4GB |
| Software | NET Framework 4.8.0 or later Windows PowerShell 5.1 and ExchangeOnlineManagement PowerShell module version 3.6 or later for Exchange Online PowerShell V3 |
| Recommendations | Exchange On-Premises: We recommend to install contactSync on a member server within the domain (e.g., dedicated contactSync server or file server). The machine should be uncritical (e.g., may be restarted without complications). The contactSync server must have a high bandwidth connection to the DC/GC. Exchange Online: See recommendations for on-premises; but you can use also a standalone computer. |
| Supported Exchange Versions* | Exchange 2013* SP1 and later Exchange 2016 and later Exchange 2019 and later Microsoft 365 Exchange Online |
* Microsoft stopped supporting Exchange 2013 on the 11th April 2023. Microsoft stopped supporting for Windows Server 2012 and Windows Server 2012 R2 on the 10th October 2023