Office
Clear Microsoft Outlook Cache on Mac
Clearing the Microsoft Outlook cache is usually safe, and it can free space or fix slow starts and search problems because the app rebuilds the data from your accounts. Try any reset option inside the app first, and remove cache files by hand only if that does not help.
Clear the Microsoft Outlook cache without guessing
Microsoft Outlook data usually takes 1 GB – 50 GB on a Mac. The free scan shows the exact size on your Mac before you change anything.
Free scan · No account · Nothing is deleted without your OK · Moves to the Trash first · macOS 14+
OptiClear is a Mac app. Copy this page's link and open it on your Mac.
Email me the link- Application
- Microsoft Outlook
- Typical data size
- 1 GB – 50 GB
- Category
- Office
- File Location
~/Library/Group Containers/UBF8T346G9.Office/Outlook
Microsoft Outlook cache folders you can clear
Microsoft Outlook has no separate cache folder. Its folders hold settings and your own data, so there is nothing to clear safely by hand.
What the Microsoft Outlook cache holds and when clearing helps
Specific to Microsoft Outlook
The cache sits in the app's sandboxed data folder at ~/Library/Containers/com.microsoft.Outlook, alongside its preferences. The profile folder inside the shared Office group container holds the local copy of your mail, calendar and contacts, and legacy Outlook keeps that full copy, so it can reach 1 GB – 50 GB. Clearing the cache helps when search stops finding mail, when the app is slow to start, or when the profile folder is very large. Remove only cache files in the app's container, never the profile folder, because it holds your own data.
What happens after you clear the Microsoft Outlook cache
The app rebuilds its cache the next time it opens, so the first start will be slower while it downloads mail again. Exchange, Microsoft 365 and Outlook.com accounts re-download from the server, but POP accounts and anything under On My Computer exist only in the local profile and are not restored from the cache. Your sign-in data is kept in shared Microsoft folders, so you may not need to sign in again, although the app may ask. Activation is tied to your Microsoft account and stays in place.
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- Account and sync
- Exchange, Microsoft 365 and Outlook.com mail stays on the server; only POP accounts and items under On My Computer exist solely in the local profile.
Try it without risk
- Download and scan for freeSee every Microsoft Outlook file and its size. No account needed.
- Clean free for 7 daysStart the 7-day free trial of the yearly plan inside the app.
- Keep it or cancelCancel in your App Store settings at least 24 hours before the trial ends and you won't be charged.
After the free trial, Pro costs $39.99 per year in your country's App Store; cancel any time.