Clarified ManagedBy, mail-enabled security groups, and Outlook group management

Issue #9068

Author: chrisda

exchange/exchange-ps/exchange/New-DistributionGroup.md

@@ -333,11 +333,11 @@ The owner you specify for this parameter must be a mailbox, mail user or mail-en
 - SamAccountName
 - User ID or user principal name (UPN)
 
-You can enter multiple values separated by commas. If the values contain spaces or otherwise require quotation marks, use the following syntax: `"Value1","Value2",..."ValueN"`.
+To enter multiple owners, use the following syntax: `Owner1,Owner2,...OwnerN`. If the values contain spaces or otherwise require quotation marks, use the following syntax: `"Owner1","Owner2",..."OwnerN"`.
 
-An owner that you specify with this parameter isn't automatically a member of the group. You need to manually add the owner as a member.
+Owners that you specify with this parameter are not automatically added as group members. Use the CopyOwnerToMember switch or manually add the owners as members.
 
-Alternatively, you can use the CopyOwnerToMember switch so the owners are automatically made members of the group.
+**Note**: Group management in Outlook doesn't work when the owner is a mail-enabled security group. To manage the group in Outlook, the owner must be a mailbox or a mail user.
 
 ```yaml
 Type: MultiValuedProperty

exchange/exchange-ps/exchange/Set-DistributionGroup.md

@@ -1110,7 +1110,9 @@ To enter multiple owners and overwrite all existing entries, use the following s
 
 To add or remove owners without affecting other existing entries, use the following syntax: `@{Add="Owner1","Owner2",...; Remove="Owner3","Owner4"...}`.
 
-An owner that you specify with this parameter isn't automatically a member of the group. You need to manually add the owner as a member.
+Owners that you specify with this parameter are not added as group members. You need to manually add the owner as a member.
+
+**Note**: Group management in Outlook doesn't work when the owner is a mail-enabled security group. To manage the group in Outlook, the owner must be a mailbox or a mail user.
 
 ```yaml
 Type: MultiValuedProperty

exchange/exchange-ps/exchange/Set-Group.md

@@ -231,7 +231,9 @@ To enter multiple owners and overwrite all existing entries, use the following s
 
 To add or remove owners without affecting other existing entries, use the following syntax: `@{Add="Owner1","Owner2",...; Remove="Owner3","Owner4"...}`.
 
-An owner that you specify with this parameter isn't automatically a member of the group. You need to manually add the owner as a member.
+Owners that you specify with this parameter are not added as group members. You need to manually add the owners as a members.
+
+**Note**: Group management in Outlook doesn't work when the owner is a mail-enabled security group. To manage the group in Outlook, the owner must be a mailbox or a mail user.
 
 ```yaml
 Type: GeneralRecipientIdParameter[]