I am getting this error that Microsoft.exchange.webservices can not be added to GAC while deploying solution.

We have got solution from other team which work on their environment. When we trying to set up development environment for same, it's giving above error.

It's SharePoint 2013 version.

What might be the cause for this?

Checked Visual Studio versions and other things already.

Any help will be great for this.


  • it sounds like you are deploying a custom solution. If it is a MS solution or open source solution please provide the details. If it is custom made you have to ask the developer.
    – Mark L
    Sep 5, 2019 at 1:48
  • if you are configuring site mailboxes in SharePoint Server, you may refer to docs.microsoft.com/en-us/SharePoint/administration/… for install procedure.
    – Mark L
    Sep 5, 2019 at 1:51
  • We are on our own. No developer to explain. Its custom solution with timer job Sep 5, 2019 at 5:34
  • maybe you can ask other team how to install?
    – Mark L
    Sep 5, 2019 at 5:48
  • Have you tried deploying without -GACDeployment parameter with Install-SPSolution command to see if it helps? Sep 5, 2019 at 5:51

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