Unified Groups are exactly what they sound like, groups that incorporate features from various O365 products in one unified feature.  These groups have simplified and stripped down functionalities designed to make self management more simple, at the cost of customizability. They include a group Distribution List, Calendar, SharePoint Site and can be self managed and created.

A full fledged SharePoint site doesn't have an email address or a calendar like a Unified Group does, and includes the full featureset for SharePoint.  Site collections must be created by HUIT, or sites... Read more about What are the differences between a Unified Group and a SharePoint site?

HUIT has implemented TAP Attachment Defense from Proofpoint on our Office 365 email system. The TAP system detects an email that contains a malicious attachment and strips the attachment to prevent phishing and targeted malware attacks. If you receive an email containing an infected attachment, Proofpoint will filter out the email to protect your account from being compromised. If you know who sent the stripped attachment, let the sender know that a malicious attachment has been propagated from their email address. Do not accept any shared files from that sender until you confirm...

Read more about I received a notification that an email attachment was removed by Proofpoint. What do I do now?

Read more about I have an email with an attachment that was delayed by Proofpoint. What happens to my email during the 5-7 minute delay?

HUIT’s spam filtering system, Proofpoint, uses a tool called Attachment Defense to check email attachments for malicious behavior before delivering them. For emails originating from a non-Harvard email address, this may cause a short delay in delivering the email. In some rare... Read more about Will attachment defense make it take longer for me to receive emails containing attachments?