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Been working on this with Microsoft last night and we found that in OWA &amp;&nbsp;mobile email and calendar functionality is perfect. <br />
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This main issue is strictly with Outlook (x 1300 mailboxes) it seems to be ok as far as receiving and sending. Most of the time. When I click on calendar and add an event it says event could not be created but I also had my OWA open and it did create the event. &nbsp;At that point I went back into Outlook mail and it wouldn't show me any emails and basically hosed Outlook and throws the error. &quot;Operation failed&quot; and no emails show up al all until you close it and reopen it. <br />
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Even the Techs with Microsoft said they've never seen this before. The last thing we tried was create a test account and added it to my outlook and it worked perfectly. Been waiting for them to call back since 1:30am they are supposed to call me in 50 minutes.
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Been working on this with Microsoft last night and we found that in OWA & mobile email and calendar functionality is perfect. 

This main issue is strictly with Outlook (x 1300 mailboxes) it seems to be ok as far as receiving and sending. Most of the time. When I click on calendar and add an event it says event could not be created but I also had my OWA open and it did create the event.  At that point I went back into Outlook mail and it wouldn't show me any emails and basically hosed Outlook and throws the error. "Operation failed" and no emails show up al all until you close it and reopen it. 

Even the Techs with Microsoft said they've never seen this before. The last thing we tried was create a test account and added it to my outlook and it worked perfectly. Been waiting for them to call back since 1:30am they are supposed to call me in 50 minutes.

Outlook crashes when addning calendar event

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.