If you're using a third-party tool like HashMyFile, you can verify the hash value in the digital signature file:
Example Hash Verification
Suppose the digital signature file (office365.iso.sig) contains the following hash value:
SHA256 315752F407CB6BDC7C7B44A042C572A44956B675
Using HashMyFile, you generate the same hash value for the office365.iso file:
SHA256 315752F407CB6BDC7C7B44A042C572A44956B675
The hash values match, indicating that the ISO file has not been tampered with.
Corporate IT managers cannot have 500 employees all downloading Office individually from the internet. They need a verified source (an ISO equivalent) to push via Group Policy or SCCM (System Center Configuration Manager).
Yes, system administrators can still use an offline installer (akin to an ISO-like package) for Office 365 via the Office Deployment Tool (ODT). This lets you:
But even that offline content inherits trust from the ISO-certified cloud backend.
