<div>
I think you are asking 2 different questions here.<br />

<blockquote>
is there a way to create an appointment for all users of our Exchange Server at once?
</blockquote>
<br />
You can add all members to a single appointment you are scheduling yes. <br />

<blockquote>
<br />
For an example, instead of the users creating the holiday schedule, the administrative assistant wants to block off the holidays for all users, done as a single task.
</blockquote>
<br />
The question above you will need some sort of corporate calendar where all people have access to update their holidays in this calendar. <br />
<br />
Will.
</div>


I think you are asking 2 different questions here.


> is there a way to create an appointment for all users of our Exchange Server at once?


You can add all members to a single appointment you are scheduling yes.


> For an example, instead of the users creating the holiday schedule, the administrative assistant wants to block off the holidays for all users, done as a single task.


The question above you will need some sort of corporate calendar where all people have access to update their holidays in this calendar.

Will.

<div>
Thank you, I will use the custom holiday option from this article.
</div>


Thank you, I will use the custom holiday option from this article.

<div>
<div class="content wysiwyg-content">
Dear Experts,<br />
<br />
I was asked to do a task that I have no idea how to do. &nbsp;Without a Group Calendar, is there a way to create an appointment for all users of our Exchange Server at once?<br />
For an example, instead of the users creating the holiday schedule, the administrative assistant wants to block off the holidays for all users, done as a single task.<br />
Please advise.
</div>
</div>


Dear Experts,

I was asked to do a task that I have no idea how to do.  Without a Group Calendar, is there a way to create an appointment for all users of our Exchange Server at once?
For an example, instead of the users creating the holiday schedule, the administrative assistant wants to block off the holidays for all users, done as a single task.
Please advise.

Setup up an appointment for all users

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.