When encountering the “OST file has reached the maximum size” error in Outlook, users may experience difficulties in sending and receiving emails, as well as accessing their mailbox. This error typically occurs when the Offline Storage Table (OST) file, which stores a local copy of mailbox data, exceeds the maximum size limit. To resolve this issue, users can try reducing the size of their OST file by deleting unnecessary emails, emptying the Deleted Items folder, or archiving old emails.
Another approach is to increase the maximum size limit of the OST file, although this may require editing the Windows Registry or using a third-party tool. Users can also try repairing their OST file using the built-in Inbox Repair tool (SCANPST.EXE) or using a third-party OST repair tool. If none of these solutions work, users may need to recreate their OST file or seek assistance from their IT administrator or Microsoft support.
It’s worth noting that the OST file size limit can vary depending on the version of Outlook being used. For example, Outlook 2013 and later versions have a maximum OST file size limit of 50 GB, while earlier versions may have smaller limits. By managing their mailbox data and regularly cleaning up their OST file, users can help prevent this error from occurring in the future.
