Outlook Server Failures Subfolder: What Each Item Type Means

When you open the Sync Issues folder in Outlook, you may see a subfolder named Server Failures. This folder stores error messages that Outlook generates when it fails to synchronize specific items with the Exchange server. Each item in this folder represents a failed sync attempt and is categorized by an item type such as IPM.Note or IPM.Appointment. Understanding what each item type means helps you diagnose why a particular email, calendar event, or contact did not sync correctly. This article explains the most common item types found in the Server Failures subfolder, what they indicate, and how to resolve the underlying issues.

What Are Outlook Server Failures and Why Do They Occur?

The Server Failures subfolder is a hidden troubleshooting folder located under Sync Issues in the Outlook folder pane. It is part of Outlook’s built-in synchronization logging system. When Outlook cannot send an item to the Exchange server or receive an update, it records the failure as a message in this folder. The item type field, displayed as a message class in the folder, tells you the kind of Outlook item that failed.

Common causes for entries in this folder include:

• Corrupted item data in a specific email, contact, or calendar entry
• Network interruptions that prevent complete data transfer
• Server-side throttling or mailbox size limits
• Conflicts between cached and server versions of an item
• Add-ins or third-party applications that modify item properties

The folder is primarily used by system administrators and advanced users for troubleshooting. Regular users may never need to open it unless they experience persistent sync problems.

How to Access the Server Failures Subfolder

Before you can examine item types, you must make the folder visible. By default, Outlook hides the Sync Issues folder. Follow these steps to display it:

1. Open Outlook and switch to the Folder List view
   In the navigation pane, click the three dots icon at the bottom and select Folder Pane. Then click Folder List. This view shows all folders including hidden system folders.
2. Expand the Sync Issues folder
   In the Folder List, scroll down to the Sync Issues folder. Click the arrow next to it to expand its subfolders. You will see Conflicts, Local Failures, and Server Failures.
3. Select the Server Failures subfolder
   Click on Server Failures. The right pane displays a list of failure entries. Each entry includes a Subject line and an Item Type column. If you do not see the Item Type column, right-click any column header, choose Field Chooser, and add Item Type.

Item Types in the Server Failures Subfolder

Each entry in the Server Failures folder has an Item Type value that starts with IPM. IPM stands for Interpersonal Message, which is the base class for Outlook items. The second part of the name indicates the specific item type. Below are the most common item types and their meanings.

IPM.Note — Failed Email Messages

IPM.Note is the most frequent entry in the Server Failures folder. It represents a standard email message that could not sync. Possible reasons include a corrupted message body, an oversized attachment that exceeds server limits, or a network timeout during upload. To resolve this, open the failed entry in the Server Failures folder, review the error description in the message body, and delete the problematic email from your mailbox if it is corrupted.

IPM.Appointment — Failed Calendar Items

IPM.Appointment indicates a calendar appointment or meeting that failed to sync. This often occurs when a meeting request contains an invalid recurrence pattern, such as an end date before the start date, or when two attendees modify the same meeting simultaneously. To fix this, delete the conflicting calendar entry and recreate it from a clean state. You can also check for corrupted recurring series by removing and re-adding the recurrence pattern.

IPM.Contact — Failed Contact Sync

IPM.Contact entries appear when a contact record fails to synchronize. Common triggers include duplicate contacts with identical email addresses, oversized custom fields that exceed the 32 KB limit per contact, or corrupted photo attachments. To resolve, remove duplicate contacts, reduce the size of custom fields, and delete any corrupted images from the contact record.

IPM.Task — Failed Task Sync

IPM.Task marks a task that could not sync. This usually happens when a task has a reminder set for a date that is outside the allowed range or when the task data contains invalid characters. To fix, open the task, clear any unusual characters in the subject or notes, and reset the reminder to a valid date.

IPM.StickyNote — Failed Note Sync

IPM.StickyNote represents a note that failed to sync. Notes are small text items, so failures are rare. When they occur, the note file may be corrupted. Delete the note and create a new one.

IPM.Post — Failed Post or Journal Entry

IPM.Post appears for failed posts in public folders or journal entries. This can happen when the public folder has reached its storage limit or when the journal entry contains an invalid date. Reduce the size of the public folder or correct the journal entry date.

Common Issues Related to Server Failures

Server Failures folder is empty even though sync problems exist

If you experience sync issues but the Server Failures folder is empty, Outlook may not have logged the failures. This can happen if the Sync Issues folder was cleared or if the logging feature is disabled. To enable logging, go to File > Options > Advanced, scroll to Other, and check Enable troubleshooting logging. Restart Outlook and reproduce the sync problem. Check the Server Failures folder again after 30 minutes.

Too many entries in the Server Failures folder

A large number of entries indicates a persistent sync problem. This often points to a corrupted mailbox item or a damaged Outlook profile. First, try deleting all entries in the Server Failures folder by selecting them and pressing Delete. If they reappear, run the Inbox Repair Tool (scanpst.exe) on your Outlook data file. If the problem continues, create a new Outlook profile.

Item type shows IPM.Note but the message body is empty

An empty message body in a Server Failures entry usually means the original item was partially deleted or corrupted beyond recovery. The safest action is to delete the entry. If you need the original email, check the Deleted Items folder or request a resend from the sender.

Server Failures Item Types: Quick Reference Table

Item Type	What It Represents	Common Fix
IPM.Note	Standard email message	Delete corrupted email or reduce attachment size
IPM.Appointment	Calendar appointment or meeting	Remove invalid recurrence patterns or conflicting updates
IPM.Contact	Contact record	Remove duplicates or reduce custom field size
IPM.Task	Task with or without reminder	Clear invalid characters and reset reminder date
IPM.StickyNote	Note	Delete and recreate the note
IPM.Post	Post in public folder or journal entry	Reduce public folder size or correct journal date

Now you can open the Server Failures subfolder, identify each item type, and apply the correct fix. For ongoing sync problems, run the Inbox Repair Tool every three months to prevent data corruption. As an advanced step, use the MFCMAPI tool to inspect the PR_MESSAGE_CLASS property of any item directly if the Item Type column is not available.