Microsoft email archiving capabilities are available in some Office 365 plans through Microsoft’s hosted Exchange Server (aka Exchange Online) for legal discovery and compliance, eDiscovery to identify, hold and analyze data throughout their business.
Microsoft implementation of archiving, although has taken a good first step, it seems limited. For example Microsoft Office 365 End-users can delete/modify messages in their In-Place Archives. If an email is deleted, it will not appear in records requests.
To prevent deletion Legal holds must be applied, but when is applied, the held messages are no longer visible in the user’s In-Place archive.
In too many instances the control falls to the end user, which is a big flaw when implementing archiving from a regulation point of view. Users should not be responsible to manage their own archiving needs by moving the email from the primary mail box to the Personal Archive. Instead, the email should always be archived, no matter what the end user preference is.
eDiscovery is limited and cannot accurately determine who received an email as BCC and distribution lists recipients are not captured.
Last but not least you are locked in with a single vendor, that owns your online mailboxes and archives.