Update about-shared-mailboxes.md

Update doc per Branden Lee's comment that shared mailboxes don't need license if org wide retention policy is applied.

Author: Smartboss88

microsoft-365/admin/email/about-shared-mailboxes.md

@@ -69,7 +69,7 @@ Before you [create a shared mailbox](create-a-shared-mailbox.md), here are some
 > [!NOTE]
 > To access a shared mailbox, a user must have an Exchange Online license, but the shared mailbox doesn't require a separate license. Every shared mailbox has a corresponding user account. Notice how you weren't asked to provide a password when you created the shared mailbox? The account has a password, but it's system-generated (unknown). You shouldn't use the account to log in to the shared mailbox. Without a license, shared mailboxes are limited to 50 GB. To increase the size limit to 100 GB, the shared mailbox must be assigned an Exchange Online Plan 2 license. The Exchange Online Plan 1 license with an Exchange Online Archiving add-on license will only increase the size of the archive mailbox. This will also let you enable auto-expanding archiving for additional archive storage capacity. Similarly, if you want to place a shared mailbox on litigation hold, the shared mailbox must have an Exchange Online Plan 2 license or an Exchange Online Plan 1 license with an Exchange Online Archiving add-on license.
 >
->If you want to apply advanced features such as Microsoft Defender for Office 365, eDiscovery (Premium), or retention policies, licenses may be required. For more information, see [Microsoft 365 licensing guidance for security & compliance](/office365/servicedescriptions/microsoft-365-service-descriptions/microsoft-365-tenantlevel-services-licensing-guidance/microsoft-365-security-compliance-licensing-guidance).
+>If you want to apply advanced features such as Microsoft Defender for Office 365, eDiscovery (Premium), or retention policies, licenses may be required. For more information, see [Microsoft 365 licensing guidance for security & compliance](/office365/servicedescriptions/microsoft-365-service-descriptions/microsoft-365-tenantlevel-services-licensing-guidance/microsoft-365-security-compliance-licensing-guidance).  For org-wide (Exchange All Locations) Purview Retention Policy, license is not needed for shared mailboxes.
 
 > [!NOTE]
 > Prior to July 2018, all unlicensed shared mailboxes were provisioned with a size of 100 GB. For more information, see [Correcting Shared Mailbox provisioning and sizing](https://techcommunity.microsoft.com/t5/exchange-team-blog/correcting-shared-mailbox-provisioning-and-sizing/ba-p/607991).