All of this may actually lead to a poor experience for your users, and an increase in support requests for you. Consider the impacts this will have on your network bandwidth, client performance, on-premises infrastructure (if you’re running a Hybrid configuration), journalling, and the fact that you’ll more often than not find that other companies you’re emailing support a far smaller message size limit. By all means increase the message size limit to suit your business, but don’t just crank it right up to 150MB for the sake of it. While I am generally of the opinion that email is a poor transport mechanism for large files I can understand how the modern era of fast networks, cheap storage capacity, and the convenience of email all come together to create the situation where large email attachments become a requirement.īefore we go any further let me point out that just because you can set a message size limit of 150MB, it doesn’t mean you necessarily should. The previous limits were a deployment blocker for some customers that I’ve worked with who either had a higher limit for their general user population (often more like 50MB) or who had a few specific mailboxes that needed to receive very large emails (often a system-monitored mailbox). This is quite a large increase from the previous limit of 25MB (actually 35MB, I’ll explain why shortly) and no doubt will be a welcome change for many customers. Microsoft has announced that Office 365 (Exchange Online) now supports up to 150MB email messages.
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