Outlook not loading new messages

Question

Microsoft Outlook reports ost file has reached maximum size, mailboxes do not receive new emails or update correctly.

Answer 1

Hi! When Classic Outlook for Windows says your .ost file has reached the maximum size, syncing can stall, so the inbox may stop updating and new mail won’t download until the local cache is reduced or rebuilt. The most reliable fix is to reduce mailbox/OST size: delete or move large/old items (then empty Deleted Items), use Outlook’s Mailbox Cleanup, and Compact the data file to reclaim space; As mentioned here:

https://support.microsoft.com/en-us/office/reduce-the-size-of-your-mailbox-and-outlook-data-files-pst-and-ost-e4c6a4f1-d39c-47dc-a4fa-abe96dc8c7ef