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Exchange 2013 5MB attachment limit OWA

My client uses OWA to send and receive emails but cannot send attachments greater than 5MB

We changed eveything in web.config and the ECP and rebooted the server but alas no luck

We tried virtually every browser and it still does it

Transport limits are both in and out at 50MB
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Rajitha Chimmani
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Check if there are any limits applied at mailbox level. And how does it work in Outlook?
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Outlook works just fine (only 1 user has it)
The rest have to use OWA
Already checked the limits at the mailbox limit and they are wide open
What a about the Receive Connectors and Send Connectors used by the Hub Transport roles?
Do you have the exact error message or is it a undeliverable?
They are set to 100MB for receive and unlimited for send.
The exact error is:

The following files weren't attached because adding them would cause the message to exceed the maximum size limit of 5MB
What is the current limit on web.config?

Have you tried moving the user mailbox? Appears to be some corruption as web.config settings are universal and should affect every user not just one.
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Bosaloski
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I researched and found some information on AD attributes that are used by OWA and exchange.