diff --git a/M365Reporting/Public/Export-M365RMailboxSizes.ps1 b/M365Reporting/Public/Export-M365RMailboxSizes.ps1
index 0f5b0c2..08a94df 100644
--- a/M365Reporting/Public/Export-M365RMailboxSizes.ps1
+++ b/M365Reporting/Public/Export-M365RMailboxSizes.ps1
@@ -10,7 +10,8 @@
             This script connects to EXO and then outputs Mailbox statistics to a CSV file.
 
         .NOTES
-            Version: 0.12
+            Version: 0.13
+            Updated: 31-07-2025 v0.13   Updates SummaryStats object; AverageItemCount was referencing TotalItemSize(MB) incorrectly
             Updated: 03-03-2022 v0.12   Replaced Export-Csv with Export-Excel (from ImportExcel Module) and added Summary page
             Updated: 01-03-2022 v0.11   Updated to an export command that calls the get command
             Updated: 01-03-2022 v0.10   Included a paramter to use an input CSV file
@@ -226,7 +227,7 @@
                 'TotalSize(MB)'           = "=SUMIF(MailboxStats[RecipientTypeDetails],A$t,MailboxStats[TotalItemSize(MB)])"
                 'AverageSize(MB)'         = "=IF(C$t<>0,(AVERAGEIF(MailboxStats[RecipientTypeDetails],A$t,MailboxStats[TotalItemSize(MB)])),0)"
                 'TotalItemCount'          = "=SUMIF(MailboxStats[RecipientTypeDetails],A$t,MailboxStats[ItemCount])"
-                'AverageItemCount'        = "=IF(E$t<>0,(AVERAGEIF(MailboxStats[RecipientTypeDetails],A$t,MailboxStats[TotalItemSize(MB)])),0)"
+                'AverageItemCount'        = "=IF(E$t<>0,(AVERAGEIF(MailboxStats[RecipientTypeDetails],A$t,MailboxStats[ItemCount])),0)"
                 'ArchiveCount'            = "=COUNTIFS(MailboxStats[RecipientTypeDetails],A$t,MailboxStats[ArchiveStatus],""Active"")"
                 'ArchiveTotalSize(MB)'    = "=SUMIF(MailboxStats[RecipientTypeDetails],A$t,MailboxStats[Archive_TotalItemSize(MB)])"
                 'ArchiveAverageSize(MB)'  = "=IF(H$t<>0,(AVERAGEIF(MailboxStats[RecipientTypeDetails],A$t,MailboxStats[Archive_TotalItemSize(MB)])),0)"