The Story of Message Size Limits and Remote Mailboxes

One of the more common configurations we see administrators implement in Exchange is a message size limit, which will limit the number of recipients on a message, the size of a message, or the size of the attachments within a message that a user can send. These limits are usually put in place to protect…


In-Place Hold feature and user License changes in Office 365

Today we are going to speak about an issue I recently came across, which doesn’t have an easy solution. This is about In-Place Hold feature and license changes made to users, while their mailboxes are included in a Mailbox Search which is also placed on In-Place Hold.  The idea was to remove In-Place Hold from…


Public folders data recovery scenarios

In Exchange Online, when it comes to public folder data recovery, we can have three scenarios: Restore public folders content. Recover deleted public folders. Recover deleted public folder mailboxes.   Restore public folder content (items) Whether public folder content means calendar entries, contacts or mail items, in order to recover this data, we need to…


How to restore an inactive mailbox for a federated user in an Exchange Hybrid deployment

This article describes the basic steps that any Exchange Administrator can take to recover an inactive mailbox of a federated user in Exchange Online that’s having also Litigation Hold enabled. Let’s assume that we are in Exchange Hybrid deployment with Office 365 and the user’s objects are created within a federated domain and synced from local Active Directory…


A basic guide on troubleshooting S/MIME issues

What is S/MIME and what is it used for: S/MIME (Secure/Multipurpose Internet Mail Extensions) is a standard for public key encryption and signing of MIME data. It is used to sign and encrypt messages to users using certificates. If a message is encrypted using S/MIME, even Exchange Admins won’t be able to see the content…


Unable to delete items from mailbox / Unable to delete items from calendar.

If you encounter the following type of issue: a user is not able to delete items from his mailbox (emails or calendar items), please follow this article and apply the proper steps to solve it. Error message samples: Remote Server returned ‘554 5.2.0 STOREDRV.Deliver.Exception:QuotaExceededException.MapiExceptionShutoffQuotaExceeded; Failed to process message due to a permanent exception with message Move/Copy messages…


Restore Out of Office state after Hybrid Migration

In the last couple of years in Exchange Online support, me and my colleagues from EMEA Office 365 Exchange Escalations Team discovered a few cases when Out of Office behavior became corrupt if was set before Hybrid Migration from Exchange on-prem servers to Exchange Online. To help customers, that encounter this type of issue, I wrote a…


PST Import- hints for troubleshooting most common scenarios

The PST import feature in Office 365 is getting quite popular and proves to be useful in numerous situations. We’ve created this article to help you better troubleshoot most PST import failures scenarios. We highly recommend you scan each PST before uploading or shipping it, in order to avoid any import failure due to corrupted PST….