Outlook Conversation View groups related emails into a single thread. When messages from the same conversation appear in separate threads, the feature is not functioning correctly. This split-thread problem makes it hard to follow email discussions. The cause is usually a mismatch between the subject line, the sender’s address, or the message ID. This article … Read more
After migrating your mailbox to a new server or a different Microsoft 365 tenant, your Outlook rules may stop running. The rules remain visible in the Rules and Alerts dialog but do not fire for incoming or outgoing messages. This happens because the rule conditions or actions reference the old server path, folder IDs, or … Read more
When you rebuild an Outlook profile to fix corruption or performance issues, all your email rules are lost unless you export them first. Outlook stores rules locally in the profile, not on the server, so a new profile starts with no rules. This article explains how to export your Outlook rules to a file, so … Read more
Rebuilding your Outlook profile is a standard troubleshooting step for sync problems, but it often fails to resolve the issue. When you delete and recreate your profile, Outlook downloads a fresh copy of your mailbox from the server. If the sync problem originates from a corrupted offline data file, a damaged Outlook data file, or … Read more
After a tenant-to-tenant migration in Microsoft 365, Outlook may repeatedly prompt you for your password even though you have already entered the correct credentials. This happens because Outlook caches the old authentication tokens and server endpoints from the previous tenant. The cached data conflicts with the new tenant configuration, causing authentication loops. This article explains … Read more
After changing your Microsoft 365 password, Outlook may refuse to add your account again. The error often appears as a repeated password prompt or a message that Outlook cannot connect to the server. This happens because Outlook caches old credentials in Windows Credential Manager and in the registry. This article explains why the cached data … Read more
You double-click an attachment in Outlook, it downloads to your computer, but then nothing opens. Or you see an error message saying Windows cannot open the file. This problem happens when the file association for the attachment type is missing or broken on your Windows system. It can also occur if Outlook is running in … Read more
You click an attached Word document or Excel spreadsheet in Outlook, but the preview pane shows a blank area, an error message, or the message “This file cannot be previewed.” This happens even though the file opens correctly when you double-click it. The root cause is usually a broken or disabled preview handler in Windows, … Read more
You save a draft message in Outlook for Windows but cannot find it when you check your drafts on Outlook on the web (OWA). This problem occurs because the default save location for drafts in Outlook is set to your local mailbox instead of the Exchange server mailbox. This article explains how to change the … Read more
You open Outlook and notice the search bar returns no results or shows outdated emails. The status bar at the bottom of the Outlook window displays “Indexing complete” or “Indexing in progress” repeatedly. This symptom points to a corrupted Offline Outlook Data File (.ost) where the search index keeps resyncing but the OST itself is … Read more