Is that a best practice?
10MB seems small since it as been that size with us for at least 5 years and file sizes and mailboxes are getting larger.
I wonder about the time wasted finding other ways send files to external users that may be any size from 11MB to 20+MB.
However, I don't want to cause network problems or have Exchange performance suffer if it chokes and bogs on larger attachments.
Also, we don't want our size limits to be above "norms," because that will only cause a new problem of message bounce backs because the recipients mail servers will reject these large messages coming from us as oversized due to the limits on their side.
So, what is a good message size limit for 2014 that we can expect most other organizations to be able to accept?