Microsoft 365 vs Unified Archiving: What You Need to Know

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Microsoft 365 logo surrounded by icons for Word, Excel, Outlook, and Office on a blue background

Archiving Is Broken (And You Probably Didn’t Know It)

You’re archiving email. Great. Are you archiving about the Teams messages where client decisions get made? The customer calls with verbal approvals? The chat threads where deals are negotiated?

Most businesses are flying blind. Their data lives across silos — email in Outlook, chat in Teams, calls in UC systems, and no way to see the full picture.

That might be fine — until an audit hits, a legal hold is triggered, or a compliance investigation escalates. Worse, the AI engine starts spitting out junk insights because half the context is missing.

Enter: Unified Archiving. One vault for every business conversation.

How Does Archiving Work in Microsoft 365?

Microsoft 365 offers native archiving for email via Exchange Online Archiving. With it, organizations can:

  • Automatically expand mailbox storage up to 1.5 TB

  • Apply retention policies for compliance

  • Search across archived content

The archive is mostly limited to email. To go further, include Teams messages, voice calls, or SMS, you’ll need:

  • Add-ons like Microsoft Purview (E5 license required)

  • Complex setup of connectors and compliance configurations

  • Limited search capabilities (200 item limits in some eDiscovery results)

Even worse, it still won’t touch your UCaaS, contact center, or SMS data.

 

Microsoft 365 Archive vs. Outlook Archive vs. Unified Archiving: A Quick Guide

Outlook Archive

Moves Mail To Local PST

NOT Compliant

Does NOT Cover Teams/SMS/Calls

CAN’T Search Across Channels

ISN’T AI/Analytics Ready 

M365 Online Archive

Cloud Based Archive For Email

Partially Compliant

Does NOT Cover Teams/SMS/Calls

Limited Searchable Across Channels

BASIC AI/Analytics Ready 

Unified Archiving

Centralized Archiving For Email, Teams, Chat, Voice, CC, SMS

Fully Compliant With Tamper-Proof Storage 

Covers Teams/SMS/Calls

 Searchable Across Channels with Metadata Filters

AI/Analytics Ready 

How Long Do Emails Stay in Archive in Office 365?

It depends on your retention policy. Microsoft 365 allows:

  • Default retention periods (e.g. 2 years)

  • Custom policies (based on mailbox type, folder, or user)

  • Manual overrides

Without clear policy enforcement or a compliance officer watching closely, it’s easy for things to fall through the cracks. Especially when users manually delete emails or rely on PST exports.

What Are the Limits of Microsoft 365 Archiving?

  • No omnichannel support — voice, SMS, CC, chat are outside the archive

  • Patchwork integrations — in many cases, require 3rd-party tools

  • Limited audit capabilities — discovery across Teams + Outlook isn’t seamless

  • Not built for AI — disjointed data = bad insights

According to Cryoserver, relying solely on Microsoft 365 can leave compliance gaps and make discovery time-consuming.

Top 5 Mistakes Businesses Make with Email Archiving

Relying on PST files: These personal archive files are easily lost, rarely backed up, and not compliant. Users often save PSTs locally, creating massive risk.

Thinking Microsoft 365 is enough: While M365 provides some retention tools, it wasn’t built for legal discovery or omnichannel coverage. Many organizations assume it’s doing more than it is.

Not including Teams, voice, and chat: Critical business conversations happen outside email. Failing to capture them means exposing your business to litigation risk and compliance violations.

Using multiple tools with no central archive: A third-party backup for email, another for chat, something else for call recording? That’s a discovery nightmare.

Delaying a solution until it’s too late: Discovery requests, legal holds, and regulatory checks aren’t “what ifs.” In reality, they’re “when” moments. If you’re unprepared, you’re exposed.

What Happens During an Audit: With vs. Without Unified Archiving

Here’s how two very different audit days unfold:

Without Unified Archiving:

  • Because Teams and UC data are fragmented, email alone is searchable.

  • Legal requests go unmet or delayed

  • Email is searchable; however, Teams and UC data is fragmented.

  • Risk of non-compliance skyrockets

  • Costs mount due to delays and consultant help

With Unified Archiving:

 

The Case for Unified Archiving (Backed by Intermedia)

With Intermedia’s latest upgrade, businesses can now:

No more silos. No more risk. Just one secure, compliant, AI-ready platform.

“With the addition of Archiving for Microsoft 365 email, we’re strengthening our ability to help businesses retain and protect their communications data across all major channels.” — Irina Shamkova, Chief Product Officer, Intermedia

Should You Use Microsoft 365’s Built-in Archiving?

Use M365 Archive if:

  • Email compliance is the sole requirement.

  • Teams, voice, and chat are not used extensively across the organization.

  • The industry operates under minimal regulatory or governance obligations.

Go Unified if:

  • The organization operates in a regulated sector such as healthcare, finance, education, or legal.

  • Rapid response to audits, legal holds, or discovery requests is a business necessity.

  • Long-term strategy includes AI adoption and structured communications data.

Final Word: One Archive. Zero Blind Spots.

Your conversations don’t just happen in email anymore.

If your archive strategy stops at the inbox, you’re only seeing part of the story — and risking a lot in the process.

With unified archiving, you don’t just protect what matters. Instead, you unlock, compliance, performance, and insight.

Want to see what unified archiving looks like in action?

Schedule a Compliance Strategy Call
Screenshot of Intermedia's Office 365 control panel showing email archiving and protection features for Microsoft 365 users

Microsoft 365 Archiving – Frequently Asked Questions