Strange.
Made a restart. Now it works.Sorry for bothering.
Thx again :) <3

Sorry. Didn't saw that the page is origin in english. #emabarrased
Google translate is getting better. :D
Hello from Hamburg,
great stuff. Thanks for this. :)
Only a small problem.
I had first adapted the code so that it puts the year and month together for me.

Sub ListSelectionYearMonth()
Dim aObj As Object
Dim oProp As Outlook.UserProperty
Dim oMail As Object
Dim sMonth
Dim sYear
Dim sYearMonth

On Error Resume Next

For Each aObj In Application.ActiveExplorer.Selection
Set oMail = aObj

sMonth = Month(oMail.ReceivedTime)
sYear = Year(oMail.ReceivedTime)

If sMonth < 10 Then
sMonth = 0 & sMonth
Else
sMonth = sMonth
End If

sYearMonth = sYear & "/" & sMonth
Set oProp = oMail.UserProperties.Add("YearMonth", olText, True)
oProp.Value = sYearMonth
oMail.Save

Err.Clear
Next

End Sub

This worked wonderfully.
Now I noticed in a folder that a grouping first by year and then by month increases the clarity.
I used the original code.
However, the column there remains empty.

Sub ListSelectionMonth()
Dim aObj As Object
Dim oProp As Outlook.UserProperty
Dim oMail As Object
Dim sMonth

On Error Resume Next

For Each aObj In Application.ActiveExplorer.Selection
Set oMail = aObj

sMonth = Month(oMail.ReceivedTime)

If sMonth < 10 Then
sMonth = 0 & sMonth
Else
sMonth = sMonth
End If

Set oProp = oMail.UserProperties.Add("Month", olText, True)
oProp.Value = sMonth
oMail.Save

Err.Clear
Next

End Sub

I'm a bit perplexed at the moment.

Glad about any advice

VG
Armin


Translated with http://www.DeepL.com/Translator (free version)

Hallo aus Hamburg,super Sache. Danke dafür. :)Kleines Problem nur.Ich hatte zuerst den Code so angepasst das er mir Jahr und Monat zusammensetzt.
Sub ListSelectionYearMonth()
Dim aObj As Object
Dim oProp As Outlook.UserProperty
Dim oMail As Object
Dim sMonth
Dim sYear
Dim sYearMonth

On Error Resume Next

For Each aObj In Application.ActiveExplorer.Selection
Set oMail = aObj

sMonth = Month(oMail.ReceivedTime)
sYear = Year(oMail.ReceivedTime)

If sMonth < 10 Then
sMonth = 0 & sMonth
Else
sMonth = sMonth
End If

sYearMonth = sYear & "/" & sMonth
Set oProp = oMail.UserProperties.Add("JahrMonat", olText, True)
oProp.Value = sYearMonth
oMail.Save

Err.Clear
Next

End Sub

Hat wunderbar geklappt.Nun ist mir in einem Ordner aufgefallen das eine Gruppierung zuersnach Jahr und dann nach Monat die Übersichtlichkeit noch erhöht.Habe als den ursprünglichen Code genommen.Dort bleibt dann allerdings die Spalte leer.
Sub ListSelectionMonth()
Dim aObj As Object
Dim oProp As Outlook.UserProperty
Dim oMail As Object
Dim sMonth

On Error Resume Next

For Each aObj In Application.ActiveExplorer.Selection
Set oMail = aObj

sMonth = Month(oMail.ReceivedTime)

If sMonth < 10 Then
sMonth = 0 & sMonth
Else
sMonth = sMonth
End If

Set oProp = oMail.UserProperties.Add("Monat", olText, True)
oProp.Value = sMonth
oMail.Save

Err.Clear
Next

End Sub

Macht mich grad etwas ratlos.
Freue mich über jeden Rat
VGArmin

The code works as in the article. But it does not apply to new letters. Every time you need to go to the created module in the Visual Basik and press F5.

I used the above vba and let me begin by saying this does help in micro management which is not available by default. this is beneficial for archival and storage and not something supposed to work automatically for incoming email. I was able to modify this a bit and also add a year column. So for all emails I was able to get a month and year so that I can group and then regroup (by year and then by month). What I did find however is there is some kind of limitation to the number of items it goes through and then exists (not sure why). For example if I were to select a folder with 18k-19k emails, it will loop only through some and then at the end of the run it will not update all the emails with the required. However if you run in smaller batches then it runs perfectly fine. The painful part here is to keep on selecting in batches. This is a pain for people like me who wish to manage or rather arrange years or emails that runs in a 6 figures in numbers. Anyone here been able to figure this out out or willing to go on a troubleshooting spree to fix this or how this can be addressed ?

That is, I want to group mails by subject and put the group with maximum mails on the top. How can I do that?

I want to :

1. Group mails by subject

2. Sort them by number of e-mails inside the group

How can I do achieve this?

Is it possible to create VBA macro to group and sort emails by week?