Call us

Our support team is happy to help you, be it for technical or administrative issues. We’re there for you!


+41 (0)84 800 80 80
(Calls from Switzerland 8 centimes / minute)


Monday to Saturday
9.00 – 12.00 am
1.30 – 5.30 pm

Technical Support

Monday to Friday
8:00 am – 5:30 pm

9:00 am – 4:00 pm


Write to us

To be able to help you as quickly and effectively as possible, we kindly ask that you make your request as specific as possible. And of course you can contact us by email:

All fields marked with «*» are mandatory and must be completed.


Outlook plugin installation

Support > > Set up & synchronisation

1. ZIP file

Unzip the «ZIP file» supplied by us (SHA-256 check sum:     0ee545f6779e7cd5d92a9ca5fa2234d847edfd6023c067b08dfd3f5dc8641cdd
and start the installation of the executable file contained within it by double-clicking on the file name «HoststarMailProOutlookPlugin.exe».

2. Select language

Select your preferred language for the installation and then click «Next».

3. License terms

Confirm the licence terms by activating the “Agreed” check box and then clicking on «Next».

4. Usage statistics

Deactivate the transferral of anonymous usage statistics and then click on «Next».

5. Configuration

Leave the configuration for SSL certificate errors as it is and then click on «Next».

6. Installation

During installation, the assistant stops at the following stage...

...and a new window opens with a security alert, which you have to confirm by clicking «Install».

7. Finish

You can then close both open windows by clicking on «Close»...

... or «Finish». The installation of the plugin is now complete.

Was this article helpful?