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
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
You have set up your email signature in Outlook on your work computer, but when you log into Outlook on another PC, the signature is missing or outdated. This happens because Outlook signature roaming relies on Microsoft 365 roaming settings, which can fail due to incorrect configuration or sync delays. This article explains why the … Read more
You have a local PST file with archived emails, but the new Outlook for Windows cannot open it. The new Outlook is a cloud-first client that connects only to Exchange Online, Microsoft 365, or IMAP accounts. Local PST files are not supported in this version. This article explains why PST files are blocked in the … Read more
After migrating your Outlook mailbox to a new server, Exchange environment, or Microsoft 365 tenant, you may notice that your inbox rules execute twice for every incoming message. Each rule applies its action — moving, copying, flagging, or forwarding a message — two times instead of once. This duplication typically occurs because two rule collections … Read more
After a user is renamed in Microsoft 365 or their display name is changed in Exchange Online, Outlook in Cached Exchange Mode may continue to show the old mailbox name in the folder pane. This happens even after restarting Outlook or waiting for the offline address book to update. The root cause is a locally … Read more
You started a mailbox repair or OST file rebuild in Outlook, but it freezes at the phrase “Updating Inbox” for hours. This leaves your email inaccessible and your calendar blank. The problem occurs when the local OST file is corrupted or when Windows Search tries to index a damaged item during the rebuild. This article … Read more