Cannot send IM from Outlook Web Apps
There are three possible reasons why you can't send IM from Outlook Web Apps (OWA). I assume first, the integration was done according to the recommendations given. Meaning you have also tested that internal IM from OWA was possible to send and receive. If you encounter the following behavior: - Presence can be queried, but I’M cannot be initiated. - If you receive an external IM, you are able to answer the external contact. - You cannot receive or send external IM from OWA While you are using the OCSLogger on the Lync Edge Server, you might see the following SIP 403 Forbidden message: Text : SUBSCRIBE request for get rich presence was rejected by the Access Edge Server Result-Code : 0xc3e93d80 SIPPROXY_E_EPROUTING_MSG_INT_GET_RICH_PRESENCE_FILTERED You also see the internal Exchange Server with ipconfig -displaydns as: _sipfederationtls._tcp.sip-domain.com Solution: 1. Your external policy do not allow access to federated partner or public ...