Invitation from a shared calendar doesn't look like it sent

Applies To:   ■ PoliteMail Desktop       □ PoliteMail Online □ PoliteMail M365

Version:  ■ 4.9   ■ 5.0   ■ 5.1+

Situation: You send a calendar invite from a shared calendar to a PoliteMail list.  Although the invitation does appear in the recipient's inbox, it looks like a regular email message - there is no meeting information, and there are no Accept or Decline buttons.

Solution: This is due to a setting in Outlook that is turned on by default (some Microsoft support information can be found here and here).  This setting changed via Outlook or via a Group Policy registry setting.

Via Outlook

1. From Outlook, go to File > Account Settings.  The Account Settings window opens.
2. Select the desired email account from the list, and click the 'Change...' button.

3. An Exchange Account Settings window appears.  Click on More Settings in the bottom left.  Another Microsoft Exchange window will appear.
4. Click on the 'Advanced' tab.
5. Uncheck the 'Turn on shared calendar improvements' checkbox, and then click 'OK', then 'Next', and then 'Done' to close all windows.

via Group Policy Registry Setting

1. Open Regedit and go to the following Registry path:

HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Outlook\Options\Calendar

2. Edit the DWORD value of Rest UpdatesForCalendar and set it to 1, and click OK.

Note that this issue is only when sending from a shared calendar to a PoliteMail list.