IT Help Guide
Outlook PST File Too Large.
Large PST files can make Outlook slow and increase the risk of corruption.
What to check
Archive older content, remove unnecessary large attachments and avoid using PST files as the primary long-term archive for business mail where a managed Microsoft 365 mailbox is available.
When to get IT support
If the issue affects multiple users, keeps returning, risks business data or you are unsure about the security impact, stop repeated trial-and-error and investigate the underlying cause.
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