For the last few years the largest email message you could send or receive in Office 365 was 25 MB. While 25 MB is more than enough for the majority of email, you might bump up against that limit when trying to send large slide decks, spreadsheets or videos. Outlook Web App (OWA) in Office 365 offers an easy way to “attach” a document as a link to where it’s saved on OneDrive for Business, a great option for sharing large files with your colleagues. But there are times when you’d prefer to send a large file as an actual attachment rather than a link. For those times, we’re pleased to announce that we’ve increased the allowed maximum message size to 150 MB, giving Office 365 administrators the ability to set the maximum message size of their choosing from 1 MB up to 150 MB.
The default maximum message size for Office 365 mailboxes is still 25 MB, and we aren’t going to change the setting on existing accounts. It turns out that some folks want an even smaller setting than 25 MB and many don’t want to change the current setting at all. So instead of us foisting a one-size-fits-all setting onto everyone, we’re now giving Office 365 customers the freedom to choose the maximum size setting that’s right for them.
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