User-Agent redirect to use any browser except IE

you can try this irule:

when HTTP_REQUEST {
    Check if the URI is /maintenance
   if {[string tolower [HTTP::header "User-Agent"]] contains msie} {
          Send an HTTP 200 response with a Javascript
         HTTP::respond 200 content \
"Browser redirectinsert your code herebody>\
Wrong browser, we will try to start a real internet browser :)" "Content-Type" "text/html" 
         return
      }
   }
}