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Office 365 Hosted Exchange Attachment size limit

Been doing O365 for a while now and just converted an office from on premise Exchange to hosted. For the first time, ran into a problem of sending large attachments.
No problem, increase the user's limit and all should be good to go. It is with OWA but not with Outlook 2010/2013.

Should I also have to modify the reg entry for Outlook's limitation on each laptop/PC?

I ask this because with on premise, never have I had to do this and since I've changed this limitation, after waiting a couple of hours still the client gets the message. Actually this message is coming from a third party application when from inside the application they are "sending" an email.

Of course, the same laptops were joined to the old domain last week and had no issues with the on premise server. But since the change, the same laptop joined to the new domain does.

Thanks for any input.
Ron

Amit Kumar

Please follow this article, it will help you to configure this.

You can customize the maximum allowed message size for any and all your mailboxes however you see fit. Want to go wild and allow everyone to send and receive 100 MB size messages? Go for it. Want to restrict students in your school from sending messages larger than 5 MB, while the faculty can send up to 50 MB? No problem. Do you have a hybrid mail configuration (some mailboxes on-premises, some in the cloud) and you want a consistent 10 MB restriction regardless where the mailbox is hosted? We have you covered. Whatever custom configuration you want to apply, whether for one, some, or all your mailboxes you can do it—as long as it’s between 1 MB and 150 MB.

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RFloyd30

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RFloyd30

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I found the solution myself, tested it and confirmed it solved the issue for my environment.