Today my boss asked me to extend the session lifetime for Outlook Web App to have a lower login frequency. As described in the article Session timeouts for Office 365 the session timeout is set to 6 hours by default.

To change the session timeout the following steps have to be executed.

  1. Connect to Exchange Online using PowerShell
    • Open a new PowerShell session
    • Specify Credential
      $UserCredential = Get-Credential

      Enter work or school account credentials

    • Create and import a new PowerShell Session

      $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri -Credential $UserCredential -Authentication Basic -AllowRedirection;
      Import-PSSession $Session

    For more details concerning connecting to Exchange Online see here.

  2. Adjust ActivityBasedAuthenticationTimeoutInterval by executing the following command

    Set-OrganizationConfig -ActivityBasedAuthenticationTimeoutInterval 08:00:00
  3. Verify Configuration

    To verify the configuration execute the following command.


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