You have archived or deleted hundreds of emails from your Outlook mailbox to free up space. But the warning that your mailbox is almost full or over its limit still appears. This happens because Outlook and the Exchange server do not update the mailbox size immediately after a cleanup. The server still sees the old … Read more
You deleted large attachments from Outlook messages expecting the OST file to shrink. Instead, the OST file size stays the same or grows. This happens because Outlook does not automatically reclaim space inside the OST file after removing data. This article explains why the OST file grows, provides a step-by-step method to compact it, and … Read more
You can receive new emails on your Outlook mobile app, but your calendar events refuse to update or appear blank. This split behavior usually points to a partial sync configuration or a permission restriction on the calendar folder. This article explains why the calendar stops syncing while mail continues, and provides the exact steps to … Read more
You have set up color categories in a shared mailbox, but those categories do not appear when another user opens the same mailbox. The categories you assign to emails or calendar items stay visible only to you. This problem occurs because Outlook stores categories in a local data file by default, not on the Exchange … Read more
When you search in Outlook, results from your Online Archive mailbox are missing. This happens even when you know the email exists in the archive folder. The root cause is that Outlook search defaults to the primary mailbox index and does not automatically include the Online Archive index. This article explains why this separation occurs … Read more
When you search for emails with attachments in Outlook, the built-in Has Attachments filter may not appear in the search results or the search bar. This problem typically occurs after a Windows update changes the search provider or when the Outlook search index becomes out of sync. This article explains why the attachments filter disappears … Read more
When you update a contact’s email address in Outlook, the autocomplete list may still display the old address when you start typing in the To field. This happens because Outlook stores a separate nickname cache that is not automatically refreshed when a contact changes. This article explains why the nickname cache overrides the updated address … Read more
You open an email in the new Outlook for Windows, but the suggested reply buttons — Quick Reply, Short Reply, and the three suggested responses — do not appear. This feature, which uses AI to generate short replies, can stop working after an update or when certain settings are changed. The problem usually happens because … Read more
After a Microsoft Teams chat, the Conversation History folder in Outlook may disappear from the folder pane. This happens when the folder is accidentally deleted, moved, or hidden due to a synchronization error between Teams and Exchange. The folder stores copies of Teams chat messages in your mailbox, and its absence prevents new chat history … Read more
When you send an email from a shared mailbox in Outlook, the sent message often appears in your personal mailbox Sent Items folder instead of the shared mailbox Sent Items. This happens because Outlook by default saves sent items to the sending account, not the mailbox from which the message was sent. This article explains … Read more