We are having some problems in Exchange when customers send us emails with large attachments. It doesn't happen all the time which is weird.

The emails show up fine on iPhones although it is very slow to show the whole email and attachment.

In OWA it gives an error - Error: Your request cannot be completed right now. Please try again later.

The emails never make it to our computer email program, Mac Outlook 2011

Hi,

Whats your Exchange 2013 version?

According to your description, I understand that the message which is sent from external customers with large attachments cant be opened in OWA and Outlook for Mac for Exchange users. Is it rights?

If that is the case, please confirm if the issue only happens with the large attachment messages. Please confirm if the message with no attachment sent from the same customer can be received and shown correctly in OWA.

Please recycle the application pools in IIS Manager to have a try. If it doesnt work, please change the OWA to use Conversation view then check whether the issue persists.

Regards,

Sorry It has been so long. The problem went away but resurfaced today. I logged into OWA and switched the users view to Conversation view and I was able to see the attachments and I was able to download them. I then turned conversations off and the error showed up again. Any suggestions?

Our IT Company opened a ticket with Microsoft and it turns out that this is a bug and that Exchange 2013 CU7 fixes the problem. We ran the update last night and the problem went away. We now see all emails with large attachments!