I am have a user who wants to attach a file larger than 10MB in Microsoft Exchange 2010. I have changed every size limit except the following...
ExternalDsnMaxMessageAttac
hSize
InternalDsnMaxMessageAttac
hSize
I have tried running this cmdlet that someone posted as follows but I get an error:
Set-TransportServer ” SERVERNAME ” -ExternalDsnMaxMessageAtta
chSize xxMB
Set-TransportServer ” SERVERNAME ” -InternalDsnMaxMessageAtta
chSize xxMB
The error is as follows:
The position peremeter can not be found that accepts argument "ExternalDsnMaxMessageAtta
chSize"
I have attached an image of when I run the "get transportconfig" command.

I have read and did all the steps for the other send and recieve parameters from the following site which was recommended on another post. Everything else is setup properly I just cant seem to change the internal and external attachsize limit. IT still shows 10MB. Thank you in advance for any help! =)
Also I have rebooted the server after I changed my other settings as well.
Get-transportserver | Set-TransportServer -ExternalDsnMaxMessageAtta