Get the ID of a meeting

The meeting ID is a unique identifier that can be used to get Calendar diagnostic logs (CDLs) for a specific meeting. Although you can use the subject of a meeting to get the CDLs, that approach generates less-detailed CDLs for all the meetings that match the subject. Therefore, we recommend that you use the meeting ID to get CDLs.

Tip

The meeting ID is a GUID that starts with 040000008200, such as 040000008200E00074C5B7101A82E00800000000A0D1E89273EFDA010000000000000000100000002D9427567554FA4AA9162A58A8B968CB.

You can use non-admin or admin methods to get the meeting ID.

Non-admin methods

Select one of the following methods, depending on your Outlook client:

• Classic Outlook for Windows
• New Outlook for Windows
• Outlook for Mac
• Outlook on the web

Classic Outlook for Windows

1. Find the meeting in your Outlook calendar, and then open it. If the meeting is a recurring meeting, and you want the meeting ID of the entire series, select The entire series when you're prompted. Otherwise, if you want the meeting ID of a single meeting in the series, select Just this one.

2. In the meeting window, select File > Save as, and then select Save to save the meeting item as an .ics file.

3. Open the .ics file in a text editor, and then search for UID:. The UID value is the meeting ID, as shown in the following example:

   UID:040000008200E00074C5B7101A82E00800000000A0D1E89273EFDA010000000000000000100000002D9427567554FA4AA9162A58A8B968CB

New Outlook for Windows

1. Locate one of the following meeting notifications in your Inbox or Deleted Items folder:

   • Meeting invitation
   • Attendee response
   • Meeting update
   • Meeting cancellation

2. Right-click the meeting item, select Save as, and then select Save to save the meeting item to a folder on your computer as an .eml file.

3. Open the .eml file in a text editor, and then search for UID=. If the text exists, the UID value is the meeting ID. If the text doesn't exist, go to the next step.

4. Search for a Base64-encoded text block that begins with QkVHSU46VkNBTEVOREFS and ends with =, and then decode the text block. You can decode Base64-encoded text by using either of the following methods:

   • Run the following PowerShell code:

     $base64Text = "<Base64-encoded text>"
     $decodedText = [Text.Encoding]::Utf8.GetString([Convert]::FromBase64String($base64Text))
     $decodedText | findstr "UID:"
     

     Note: The Base64-encoded text block can contain spaces, so make sure that you surround the text block by using quotation marks.

   • Use a desktop app. For example, if you have MFCMAPI installed, select Tools > Hex editor to open the Hex Editor window, and then paste the Base64-encoded text into the Base 64 section of the Hex Editor window. The decoded text appears in the Text (Ansi/Unicode) section of the Hex Editor window.

   The following screenshot shows an example of the Base64-encoded text block in an .eml file.

   

5. In the decoded text, search for UID:. The UID value is the meeting ID, as shown in the following example:

   UID:040000008200E00074C5B7101A82E00800000000A0D1E89273EFDA010000000000000000100000002D9427567554FA4AA9162A58A8B968CB

Outlook for Mac

Note

This method applies to both the new Outlook for Mac and the classic Outlook for Mac.

1. Find the meeting in your Outlook calendar, and then drag the meeting from your Outlook calendar to a folder on your computer. This action saves the meeting item as an .ics file in the folder.

2. Open the .ics file in a text editor, and then search for UID:. The UID value is the meeting ID, as shown in the following example:

   UID:040000008200E00074C5B7101A82E00800000000A0D1E89273EFDA010000000000000000100000002D9427567554FA4AA9162A58A8B968CB

Outlook on the web

Use either of the following methods.

Tip

Select Method A if your Outlook Inbox or Deleted Items folder contains a meeting notification, such as a meeting invitation, attendee response, meeting update, or meeting cancellation. Otherwise, select Method B.

• Method A: Use the same steps that are provided for the new Outlook for Windows.

• Method B: Use the network tool in Microsoft Edge, as described in the following steps:

  1. Open your calendar in the Edge browser, but don't select the meeting.

  2. In the browser menu, select More tools > Developer tools to open the developer tools pane.

  3. On the Network tab, select the Filter icon, and then enter GetCalendarEvent in the filter box, as shown in the following screenshot.

     

  4. Select (single-click) any day in the calendar, and then select the meeting. A network request entry should appear in the Name column.

  5. Select the entry in the Name column, and then select the Response tab. The UID value in the body of the response is the meeting ID.

  Note

  If you select the wrong meeting and have to start over, refresh the webpage, and then repeat steps 4 and 5.

Admin methods

Select one of the following methods, depending on whether you know the subject of the meeting:

• Subject is available
• Subject isn't available

Subject is available

Run the following commands in Exchange Online PowerShell to get the meeting ID for meetings that match the search criteria. The search criteria are the subject of the meeting and the user ID of a meeting participant. The code uses the Get-CalendarDiagnosticObjects cmdlet to get the start time and ID of each meeting.

$meetingSubject = "<subject of the meeting>"
$userId = "<ID of a user who has the meeting in their calendar>"
$cdls = Get-CalendarDiagnosticObjects -Identity $userId -Subject $meetingSubject -ExactMatch $true
$cdls | Sort -Unique CleanGlobalObjectId | FL SubjectProperty, CleanGlobalObjectId, StartTime

For each meeting that's listed in the output, the value of the CleanGlobalObjectId parameter is the meeting ID, as shown in the following screenshot.

If the output lists multiple meetings, ask the user to confirm the meeting time.

Subject isn't available

Select either of the following methods:

• Use Exchange Online PowerShell
• Use Microsoft Graph PowerShell

Use Exchange Online PowerShell

Run the following commands in Exchange Online PowerShell to get the meeting ID for meetings that match the search criteria. The search criteria are the meeting time and the user ID of a meeting participant. The code uses the Get-CalendarViewDiagnostics and Get-CalendarDiagnosticObjects cmdlets to get the subject and ID of each meeting.

$meetingStartUtc = "MM/DD/YYYY HH:MM:SSZ"  # 'Z' means UTC time.
$userId = "<ID of a user who has the meeting in their calendar>"
$cvds = Get-CalendarViewDiagnostics $userId -WindowStartUtc $([DateTime]$meetingStartUtc).AddHours(-1) -WindowEndUtc $([DateTime]$meetingStartUtc).AddHours(1)
$cdls = $cvds | % {Get-CalendarDiagnosticObjects $userId -MeetingId $_.GlobalObjectId -ShouldBindToItem $true}
$cdls | Group-Object CleanGlobalObjectId, SubjectProperty, {$_.StartTime.ToString()} | %{$_.Group[0]} | FL SubjectProperty, CleanGlobalObjectId, StartTime

Note

The Get-CalendarViewDiagnostics cmdlet finds all meetings that overlap any part of the time range that's defined by the WindowStartUtc and WindowEndUtc parameters. The code example sets a two-hour range.

For each meeting that's listed in the output, the value of the CleanGlobalObjectId parameter is the meeting ID, as shown in the following screenshot.

If the output lists multiple meetings, ask the user to confirm the subject of their meeting.

Use Microsoft Graph PowerShell

Run the following commands in Microsoft Graph PowerShell to get the meeting ID for meetings that match the search criteria. The search criteria are the meeting time and the user ID of a meeting participant. The code uses the Get-MgUserCalendarView cmdlet to get the subject and ID of each meeting.

$meetingStartTime = "<YYYY-MM-DDThh:mm:ssZ>" # ISO 8601 format. 'Z' means UTC time.
$userId = "<ID of a user who has the meeting in their calendar>"
Get-MgUserCalendarView -UserId $userId -StartDateTime $meetingStartTime -EndDateTime $meetingStartTime |  Select-Object -Property Subject, ICalUId -ExpandProperty Start | FL Subject, ICalUId, Datetime, Timezone

Note

The Get-MgUserCalendarView cmdlet finds all meetings that overlap any part of the time range that's defined by the StartDateTime and EndDateTime parameters. For the narrowest range, pass the meeting start time to both parameters.

For each meeting that's listed in the output, the ICalUId parameter value is the meeting ID, as shown in the following screenshot.

If the output lists multiple meetings, ask the user to confirm the subject of their meeting.