Can My Employer See Deleted Teams Messages? Retention Decides

Yes, in many companies. When you delete a Teams message, people in the chat see only "This message has been deleted." But if your company has a Microsoft Purview retention policy for Teams, or a legal hold on your mailbox, a copy of the message is kept and a compliance admin can find it with eDiscovery. Microsoft's documentation says the same about edits: the original text of an edited message is kept too. Without a retention policy or hold, Microsoft does not promise to keep a deleted message, and it goes away. The Teams app code agrees: when we read it on 26 October 2026, a deleted message came back from the server with a delete time and a "can be undeleted" flag, so deleting first hides a message and does not erase it.

Your manager usually cannot do this from Teams. Searching deleted messages needs an eDiscovery role in Microsoft Purview, which IT, legal or HR compliance staff hold, and the search itself is logged. The details are below.

The Slack answer to this question is in can Slack see deleted messages.

Where a deleted Teams message goes

Teams keeps a compliance copy of chat and channel messages in Exchange Online mailboxes. Chat messages go to a hidden folder in the mailbox of each person in the chat. Channel messages go to a hidden folder in the team's group mailbox. Microsoft says these folders "store data that compliance administrators can search with eDiscovery tools."

With a retention policy, Microsoft documents this path:

• You delete the message. It disappears from the Teams app for everyone in the chat.
• For 21 days, the message stays where it was, out of sight.
• Then it moves to SubstrateHolds, a hidden folder for soft-deleted items, for at least 1 day.
• When the retention period ends, a timer job deletes it for good, usually within 1 to 7 days.

A hold stops the last step. Microsoft: "While the mailbox is included in an applicable hold, Teams chat and channel messages that have been deleted will no longer be visible in the Teams app but will continue to be discoverable with eDiscovery." Holds are used for lawsuits and internal investigations, and you are not told when one is placed.

What the Teams app code shows about deleting

We read the code of the Teams web client that teams.microsoft.com served on 26 October 2026; downloading it needs no sign-in. This script prints the fields Teams loads for a deleted chat message and checks for the soft and hard delete fields:

import re, urllib.request
UA = {"User-Agent": "Mozilla/5.0 Chrome/140.0"}
CDN = "https://teams.public.onecdn.static.microsoft/teams-modular-packages/hashed-assets/"
get = lambda u: urllib.request.urlopen(urllib.request.Request(u, headers=UA), timeout=90).read().decode()
html = get("https://teams.microsoft.com/v2/")  # no sign-in needed
code = get(CDN + re.search(r"hashed-assets/(async-entry-\w+\.js)", html).group(1))
print(re.search(r"fragment DataClientChatDeletedMessageFragment_deletionInfo on Message \{[^}]*\}[^}]*\}", code).group(0))
for f in ("softDeleteReason", "hardDeleteReason", "hardDeleteTime", "ThreadActivity/RetentionDeleted"):
    print(f, f in code)

What it printed:

fragment DataClientChatDeletedMessageFragment_deletionInfo on Message {id,deleteTime,deletionInfo {showMessageAsDeleted,canBeUndeleted,deleteFailed},isDeletedByAdmin,sharedToMessageId,version}
softDeleteReason True
hardDeleteReason True
hardDeleteTime True
ThreadActivity/RetentionDeleted True

Three things follow from that output:

• A deleted message is still a message object with a deleteTime, and the server tells the app whether it canBeUndeleted. That is how Undo can bring it back, so the text is still stored after you press Delete.
• The schema keeps a soft delete (softDeleteReason) apart from a hard delete with its own hardDeleteTime. That matches the two stages in Microsoft's retention path above: hidden first, purged later.
• isDeletedByAdmin marks messages an admin removed, and RetentionDeleted is a chat system message for messages a retention policy removed. Both are separate from a delete by the sender.

Can my employer see edited Teams messages?

Other people in the chat see the new text with an Edited label. They cannot open the old version. Teams has no edit history for users.

Compliance admins can. Microsoft's retention documentation says: "If a chat or channel message is edited or deleted by a user during the retention period, the original message is copied (if edited) or moved (if deleted) to the SubstrateHolds folder." So under a retention policy, each earlier version of an edited message stays searchable.

What coworkers see when you edit, and how read receipts work, is in does Teams show edited messages.

Who can see what

Who	Deleted message	Edited message
People in the chat	A "This message has been deleted" line	The new text and an Edited label
Your manager, in Teams	The same as anyone in the chat	The same as anyone in the chat
Compliance admin, with eDiscovery	The full text, if retention or a hold applies	The original text too, if retention applies
The audit log	A "Deleted a message" event (MessageDeleted)	An "Edited a message" event
Email and notifications already sent	Any copy stays	Any copy stays

The last row catches people out. If Teams already emailed a missed-message notice, or a colleague's phone showed the text in a notification, deleting the message later does not pull those copies back.

What an admin runs to find them

These are the searches a compliance admin can run: the audit search in Exchange Online PowerShell, the content search in Security & Compliance PowerShell. Both need admin roles a normal user does not have:

# audit log: who deleted Teams messages in the last 30 days
Search-UnifiedAuditLog -StartDate (Get-Date).AddDays(-30) -EndDate (Get-Date) `
  -Operations MessageDeleted -ResultSize 100

# content search: Teams messages in one person's mailbox
New-ComplianceSearch -Name "teams-review" -ExchangeLocation "person@company.com" `
  -ContentMatchQuery "kind:microsoftteams"
Start-ComplianceSearch -Identity "teams-review"

Microsoft marks some Teams audit events as available only with certain licenses, so not every company has the MessageDeleted record. The content search is available with the standard Purview tools.

Can my employer see all my Teams messages?

Every chat and channel message you send in a work account sits in company mailboxes, and a compliance admin with eDiscovery can search them, including private one-to-one chats. No one reads them by default. A search is a deliberate step, usually for a legal request, an HR case or a security review. Some companies also run communication compliance policies that scan messages for set words and flag matches to reviewers. Who can read your chats, and each tool they use, is in can my employer read my Teams chats.

What Teams records beyond messages, such as sign-ins, activity counts and your status, is in does Teams track your activity. The wider picture of workplace monitoring is in how do employers monitor remote workers.

Calls follow different rules from chat. What your employer can hear, record and search is in can my employer listen to my Teams calls.

Can you undo or fully delete a message?

• • Undo. Right after you delete a message, Teams shows Undo in its place. Use it, and the message comes back for everyone.
• • Fully delete. You cannot remove the compliance copy. Only the retention policy, set by your admin, decides when it goes.
• • Delete the chat. Deleting a whole chat removes it from your chat list. The other people keep it, and the compliance copies stay.

Teams vs Slack on deleted messages

The Slack details, by plan, are in can Slack see deleted messages, what each step removes when you delete a DM in Slack is from our own test, and what Slack admins can read in DMs is in can Slack be used to monitor employees.

FAQ

Can my boss see my deleted Teams messages? Not from Teams. Your boss sees what anyone in the chat sees. A compliance admin can find the text with eDiscovery if your company retains Teams messages.

Does Teams keep deleted messages? Only if a retention policy or a hold applies. Then the message stays hidden for 21 days, moves to the SubstrateHolds folder, and is deleted when the retention period ends.

Does Teams show edited messages? It shows an Edited label, not the old text. Compliance admins can see the original if retention applies.

Can IT recover a deleted Teams chat? IT can find retained messages with eDiscovery and export them. They cannot restore them into your chat.

Is deleting a Teams message logged? It can be. The audit log has a MessageDeleted event, on the licenses where Microsoft records it.

Will I know if my employer searches my Teams messages? No. eDiscovery searches are logged for admins, not shown to you.