Howto increase the maximum accepted content length in Exchange Web Services.

  1. Open Explorer
  2. Navigate to C:\Program Files\Microsoft\Exchange Server\ClientAccess\exchweb\ews
  3. Open the file Web.Config in with notepad
  4. Go to the end of the file
  5. Insert the following XML tags before the </configuration> tag, note that 104857600 indicates 100mb. <pre><system.webServer> <security> <requestFiltering> <requestLimits maxAllowedContentLength=”104857600” /> </requestFiltering> </security> </system.webServer>


  1. Restart IIS: