<div dir="ltr"><div dir="ltr">All,<div><br></div><div>I have a client with a hybrid Exchange/O365 system.</div><div><br></div><div>I have an issue where free/busy information is retrieved successfully from Exchange users but not O365 users.</div><div><br></div><div>O365 users return a 'mailbox not found' error along with the contents of this SOAP message.</div><div><br></div><div>11:38:35.878 |system.pe.eal.ews 573278 DEBUG <?xml version="1.0" encoding="utf-8"?><s:Envelope xmlns:s="<a href="http://schemas.xmlsoap.org/soap/envelope/">http://schemas.xmlsoap.org/soap/envelope/</a>"><s:Header><h:ServerVersionInfo MajorVersion="15" MinorVersion="0" MajorBuildNumber="1367" MinorBuildNumber="0" xmlns:h="<a href="http://schemas.microsoft.com/exchange/services/2006/types">http://schemas.microsoft.com/exchange/services/2006/types</a>" xmlns="<a href="http://schemas.microsoft.com/exchange/services/2006/types">http://schemas.microsoft.com/exchange/services/2006/types</a>" xmlns:xsd="<a href="http://www.w3.org/2001/XMLSchema">http://www.w3.org/2001/XMLSchema</a>" xmlns:xsi="<a href="http://www.w3.org/2001/XMLSchema-instance">http://www.w3.org/2001/XMLSchema-instance</a>"/></s:Header><s:Body xmlns:xsi="<a href="http://www.w3.org/2001/XMLSchema-instance">http://www.w3.org/2001/XMLSchema-instance</a>" xmlns:xsd="<a href="http://www.w3.org/2001/XMLSchema">http://www.w3.org/2001/XMLSchema</a>"><m:FindItemResponse xmlns:m="<a href="http://schemas.microsoft.com/exchange/services/2006/messages">http://schemas.microsoft.com/exchange/services/2006/messages</a>" xmlns:t="<a href="http://schemas.microsoft.com/exchange/services/2006/types">http://schemas.microsoft.com/exchange/services/2006/types</a>"><m:ResponseMessages><m:FindItemResponseMessage ResponseClass="Error"><m:MessageText>The SMTP address has no mailbox associated with it.</m:MessageText><m:ResponseCode>ErrorNonExistentMailbox</m:ResponseCode><m:DescriptiveLinkKey>0</m:DescriptiveLinkKey><m:MessageXml><t:Value Name="SmtpAddress"><a href="mailto:xxxx@xxxxx.org">xxxx@xxxxx.org</a></t:Value></m:MessageXml></m:FindItemResponseMessage></m:ResponseMessages></m:FindItemResponse><br></div><div><br></div><div>We know the mailbox exists because the person can send and receive mail without issue.</div><div><br></div><div>Any ideas or advice?</div></div></div>