SM 9511: A user who could see and edit a resource (e.g., calendar) shared by another user can no longer edit it.

Problem reported by Gabriele Maoret - SERSIS - 1/21/2026 at 3:53 AM

Resolved

A user who could see and modify a resource (e.g., calendar) shared by another user can no longer modify it.

In practice, they had full access before the update, but now their permissions are limited to read-only.

Furthermore, they cannot see or modify the permissions of the shared resource due to another bug (see here: SM 9511 Windows: unable to edit/share resources (folder, calendars, etc...)).

The problem occurs on Windows servers (I haven't tried Linux).

Gabriele Maoret - Head of SysAdmins and CISO at SERSIS

Currently manages 6 SmarterMail installations (1 in the cloud for SERSIS which provides services to a few hundred third-party email domains + 5 on-premise for customers who prefer to have their mail server in-house)

3 Replies

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Derek Curtis Replied

1/21/2026 at 12:25 PM

Employee Post

Is it just a single user, or all users? (I'm guessing one, but wanted to make sure.) And this is the user on Windows Server 2022, per the thread you linked to?

Derek Curtis CCO SmarterTools Inc. www.smartertools.com

Gabriele Maoret - SERSIS Replied

1/21/2026 at 1:24 PM

Marked As Resolution

After some research, I found the problem: for some strange reason, the "Folder Sharing" feature was disabled on all domains.

I enabled it in "Domain Defaults" and propagated it.

Now everything works again.

Gabriele Maoret - Head of SysAdmins and CISO at SERSIS Currently manages 6 SmarterMail installations (1 in the cloud for SERSIS which provides services to a few hundred third-party email domains + 5 on-premise for customers who prefer to have their mail server in-house)

Derek Curtis Replied

1/21/2026 at 1:35 PM

Employee Post

Nice! Thanks for following up, Gabriele!

Derek Curtis CCO SmarterTools Inc. www.smartertools.com

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