Exchange Online is continually evolving, providing more granular security controls. One crucial area I often find overlooked is securing Microsoft Graph API permissions like Mail.Send or Mail.Read. By default, applications registered in Microsoft Entra ID might have access to every mailbox within an organization. This poses significant security and compliance risks. Implementing RBAC in Exchange […]
EWS in Exchange Online is Being Deprecated – Everything You Need to Know
1. Introduction Microsoft recently announced that Exchange Web Services (EWS) in Exchange Online will be fully deprecated by October 1, 2026. This means that all applications, scripts, and integrations relying on EWS will stop working. You can react to EWS Deprecation Exchange Online with MS Graph API! If your business still depends on EWS, it’s […]
Microsoft Introduces New Exchange Online Tenant Outbound Email Limits
Microsoft recently announced new tenant-level outbound email limits for Exchange Online. These limits, referred to as Tenant External Recipient Rate Limits (TERRL), regulate the number of emails that a tenant can send to external recipients per day. The limits are calculated based on the number of licensed email users within the tenant. While most organizations […]
Mailbox Migration from Exchange Online to On-Prem Fails? Fix the Issue in Minutes!
Mailbox Migration from Exchange Online to On-Prem Fails? Acommon issue is an ExchangeGUID mismatch. This occurs when the ExchangeGUID does not match between Exchange Online and on-premises Exchange, causing the move request to fail. In this guide, we’ll walk through how to correctly synchronize the ExchangeGUID and ensure a smooth migration using PowerShell, based on […]