# Can I delete Outlook 15 Profiles to free up space on Mac?

- URL: https://moreroom.app/folders/office-outlook-data
- Item: Outlook mailboxes
- Location: `~/Library/Group Containers/UBF8T346G9.Office/Outlook/Outlook 15 Profiles`
- Verdict: Keep — your data — Your data. Shrink it from its app; don’t delete the folder.
- Comes back on its own: no
- From the app: Outlook > Settings > Accounts: limit how much mail is kept offline, or archive old mail.
- Source: MoreRoom rules catalogue (2026-10-17), by Yando Pte. Ltd.

## What is it?

Outlook for Mac’s local database: a copy of the mail, attachments, calendars and contacts of each account, in `Outlook 15 Profiles` inside the Office group container. With large mailboxes it can reach tens of GB.

## What happens if you delete it?

For Microsoft 365, Exchange and IMAP accounts the data downloads again from the server, which takes time. Anything stored only on this Mac (On My Computer folders, imported archives, local calendars) is lost.

## How to remove it properly

Do not delete it in Finder. Reduce it from Outlook: empty Deleted Items and Junk, delete or archive large old messages, and remove accounts you no longer use. In legacy Outlook, Tools › Export saves an .olm archive you can keep elsewhere.

## Before you delete it

Back up the profile before any repair or reset; Microsoft’s Outlook Profile Manager is the supported way to start a fresh profile.