The local cache size or OST file grows as you send and receive more emails in Outlook. Outlook synchronizes the mailbox data from the Exchange or Office 365 servers and stores it in a local cache or offline folder (.OST) file. When you add an Exchange or Office 365 mailbox in Outlook, the profile is set up in Cached Exchange Mode by default. You can now ask users to restart their Outlook for the changes to take effect. Go to File > Account Settings > Account Settings.To disable shared mailbox caching in Outlook 2010, After this, restart Outlook for the changes to take effect.Under the Advanced tab, uncheck the Download shared folders option.Click on the Email tab and then select the email profile.To disable shared mailbox caching in Outlook 2007, Disable Cache for Shared Mailbox via Outlook Settingsįollow these steps to disable the shared mailbox caching in Outlook 2007, 2010, 2013, 2016, 2019, and 2021. This can help you significantly reduce the risk of OST oversizing and prevent performance issues and errors. Thus, you can keep your user mailbox synchronized and access shared mailboxes in online mode. Learn more, How to disable the Cached Exchange Mode for your Outlook profile?įortunately, Outlook provides an option to disable caching only for shared mailbox. However, you won’t be able to access your emails when offline or encounter errors if the network is unstable or not available. You can disable the Cached Exchange Mode for your Outlook profile, which will also disable the cache for the shared mailboxes automatically. Thus, all mail items are synchronized from the mailbox server to the local cache, including shared mailbox. Usually, the Cached Exchange Mode is enabled for the Microsoft Exchange and Office 365 profiles by default. Can We Disable Cached Exchange Mode for Shared Mailbox? Thus, it’s important to keep the local cache under recommended limits and ensure consistent Outlook performance without the risk of corruption or data loss. If this situation further deteriorates, it may result in damaged or inaccessible OST, preventing users from accessing their email accounts in Outlook. Sometimes, the OST or local cache becomes inconsistent, preventing Outlook from storing new mail items and leading to synchronization errors. Outdated mailbox folders in OWA or Outlook 365.Delay in sending or receiving new emails.When this happens, users may start experiencing Outlook performance issues, such as: OST file size quickly and may exceed the recommended OST file size limit (~20 GB). If you also have access to one or more shared mailboxes in your organization and use the same Outlook profile to access them, this can increase the local cache or. These mailboxes have a generic email address, such as or Usually, shared mailboxes are set up in an organization to provide access to specific users in different departments to monitor or respond to the users’ or clients’ emails and queries. A shared mailbox is a common mailbox that multiple users can access and use to send or receive messages.
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