We just recently updated our .NET client to 4.5.2 and received a call from a user who was attempting to edit External Contacts through OWA. I was able to duplicate their experience. Both computers have the new .NET 4.5.2 installed and are using
Internet Explorer 10. If you open OWA through Firefox, the slowness issue disappears. We are running Exchange Server 2010 SP2. Any help would be greatly appreciated.
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