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 https://outlook.office365.com/powershell-liveid/ -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.

   Get-OrganizationConfig