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Outlook 2016 / Outlook 2019 / Outlook 2021 / Microsoft 365.HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\PST HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\PST

To increase the maximum size of an ost-file in Outlook, you’ll need to create and set 2 values in the following location in the Registry So whenever you see “pst” in this guide, it also applies to ost-files. Note: The file size settings and restrictions for ost-files are handled by the same methods as for pst-files. These techniques are discussed after the Registry and Group Policy method. When your computer can’t deal with larger ost-files, then you can still use other techniques to reduce the size of the ost-file. You can increase the maximum ost-file size via the Registry or Group Policy. However, you are of course free to try and see if your computer can deal with larger ost-files. In Outlook 2010, 2013, 2016, 2019, 2021 and Microsoft 365, this limit is set to 50GB.Īlthough you can increase this limit beyond 50GB, it is not recommended to do so due to possible performance concerns. In Outlook 2007, the maximum size of a Unicode ost-file has been limited to 20GB. How can I increase the limit for ost-files and make Outlook support larger mailboxes? I find it odd that they support 100GB mailboxes on Exchange while the recommended maximum ost-file size for Outlook is still 50GB. However, the Outlook ost-file is apparently a lot more limited as I’m getting synching errors and my ost-file is “only” around 50GB in size. I have a very large mailbox and luckily my Exchange Online mailbox has a limit of 100GB so I have more than enough storage left for my mailbox.