Hi,
look at this thread : https://devcentral.f5.com/questions/sharepoint-and-office-integration-part-2
I posted an irule and the VPE screenshot assigned to.
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If user selected private computer in Logon page, it insert a dedicated cookie with sessionid and create the MHRSession cookie only if user agent is not a browser... if the SAML IdP does not provide a trusted information, you can
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If the user want to edit a previously authenticated session, it enable Clientless mode (Basic authentication) or MSOFBA (form base Auth supported by Office clients)
The MSOFBA is validated with SAML Authentication as I created the irule to migrate from AD auth to SAML.