<div>
try these:<br />
<br />
<a href="http://support.microsoft.com/kb/243595" rel="ugc nofollow">http://support.microsoft.com/kb/243595</a><br />
<br />
<a href="https://www.experts-exchange.com/questions/21948850/User-has-removed-Anonymous-from-the-Calendar-Properties-Permissions-tab.html" rel="ugc">https://www.experts-exchange.com/questions/21948850/User-has-removed-Anonymous-from-the-Calendar-Properties-Permissions-tab.html</a><br />
<br />

</div>


try these:

http://support.microsoft.com/kb/243595 [http://support.microsoft.com/kb/243595]

https://www.experts-exchange.com/questions/21948850/User-has-removed-Anonymous-from-the-Calendar-Properties-Permissions-tab.html [https://www.experts-exchange.com/questions/21948850/User-has-removed-Anonymous-from-the-Calendar-Properties-Permissions-tab.html]



<div>
Neither of these solutions helped me. &nbsp;<br />
The first link is regarding public folders and that does not help my problem.<br />
The second suggests PFDAVadmin which I can't use with Exchange 2010.<br />
<br />
Does anyone else have ideas?<br />

</div>


Neither of these solutions helped me.  
The first link is regarding public folders and that does not help my problem.
The second suggests PFDAVadmin which I can't use with Exchange 2010.

Does anyone else have ideas?


<div>
then maybe running a repair on the Outlook install could fix that for you.
</div>


then maybe running a repair on the Outlook install could fix that for you.

<div>
running the repair did not fix the issue.
</div>


running the repair did not fix the issue.

<div>
<div class="content wysiwyg-content">
Outlook 2007, Exchange 2010
</div>
</div>


How can I add anonymous and default back to the calendar permissions if they have been removed?

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.

Outlook

Microsoft Office is an integrated suite of applications that includes Outlook, Word, Excel, Access, PowerPoint, Visio and InfoPath, along with a number of tools to assist in making the individual components work together. Coding within and between the projects is done in Visual Basic for Applications, known as VBA.