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Block synchronization of specific file types (OST files)

You can prevent users from uploading specific file types when they sync their OneDrive files.

OneDrive admin center

Browse to https://admin.o nedrive.com - press Sync, and block the desired file extents in this format:

.ost
.pst
.pkg
.iso

Ost = Outlook ofline folder
PST = Outlook data file
PKG = a mac installation file
iso = an image file for Windows, for example.

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The result!

As a result, OSTs in this case will no longer end up on users' personal OneDrives.

This fixes 2 problems: Long synchronization times due to large files. And prevents forwarding of these files.

This view shows you clearly which types of files are not allowed.

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This view shows where the "problem" file is located.

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After deleting, you will see that there are no more errors on the OneDrive client.

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Powershell Commandlets: Set-SPOTenantSyncClientRestriction | Docs
Source article: Block syncing of specific file types - OneDrive | Microsoft Docs
Also read this complete OneDrive tips.

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