Increase Maximum Size of PST and OST for Microsoft Outlook

article #1073, updated 20 days ago

For a very long time, it was thought gospel that Outlook had hard caps on size of PST and OST files, which equals a hard cap on the size of a mailbox that Outlook can see. This has, apparently, changed. 100-gigabyte OSTs are possible, and presumably larger. It is thought that very fast hard drives primarily, and certainly also good CPU and lots of RAM, are needed to reliably handle huge mailboxes and PSTs without corruption. It’s done by registry entries.

https://support.microsoft.com/en-us/help/832925/how-to-configure-the-size-limit-for-both—pst-and—ost-files-in-outloo

https://www.msoutlook.info/question/increase-pst-file-size-limit

Categories:   Outlook