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Phone: +1 (905)-655-9262
Fax: +1 (905)-655-9395

Phone: +45 7944 7000
Fax: +45 7944 7001

Phone: +86 (21) 2221 8396
+45 7944 7002

+44 (0) 203 002 3889

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+1 (202)-536-4165
Knowledgebase: Digital Sign Service
System requirement for Digital Sign Service Server


The following software requirements should be met in order to allow Digital Sign Service to work properly

Server Component



Windows Server 2008 R2 SP1 (Extended Support – see note *)
Windows Server 2012 (FULL) (Extended Support – see note *)
Windows Server 2012 R2 (FULL) (Extended Support – see note *)
Windows Server 2016 (FULL)


Exchange Server
Microsoft Exchange Server 2010 (Extended Support – see note *)
Microsoft Exchange Server 2013 (Extended Support – see note *)
Microsoft Exchange Server 2016
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1, E3, E4
Office 365 Education E1, E3, E4
Office 365 Government E1, E3, E4

Note: Exchange Online plan with EWS Application support see Exchange Online Service Description
These are the supported Exchange Servers confirmed by Add-On Products, but other editions will often also work. So do not hesitate to contact Add-on Products so we can clarify if your environment needs are supported.

Microsoft .NET Framework version 4.5.1


Limitations of Digital Sign Service.
For On-premises Exchange Server setup, the application needs to be installed in the same forest/domain as the resources mailboxes it needs to access

The mailbox for the service account cannot be hidden in the Global Address List

Service Account
The service account must have impersonation rights for resource mailboxes.

Product support Lifecycle
Product support Lifecycle policy for Digital Sign Service  can be found here

* Extended Support
Add-On Products offers Extended support to clients using certain “Out of Mainstream Support” Microsoft products with our software. This allows you to retain support access for your Add-On Products software while continuing to use older Microsoft products.

Whenever Add-On Products releases a new ‘major release’ (like version 7.0 > version 7.1 or version 7.1 > version 8.0), we will update our system requirements for the product to only contain Microsoft platform products versions, which are in Microsoft Mainstream support. See Microsoft Lifecycle Policy.

If you use a Microsoft product which has ended its mainstream support, you may still be able to be covered by our support – just purchase extended support for the Add-On Products product in question. For more information, please contact your reseller or us directly by sending an email by clicking here.