Migrating hefty Lotus Notes NSF mailboxes to Outlook PST without disrupting users is challenging--but achievable with the right strategy. The key is to minimize downtime while ensuring data integrity and compliance. Start by auditing your NSF data: identify mailbox sizes, inactive users, and high‑risk items (encrypted mails, archives, shared mailboxes). This helps you prioritize which mailboxes to migrate first and plan bandwidth usage. Always back up NSF files and create a rollback plan before any live migration. Next, choose a professional NSF-to-PST converter that supports batch conversion, selective migration, and incremental export. Incremental sync lets you migrate bulk data off-hours, then only transfer new or changed items during a brief cutover window--reducing downtime to near zero. Use filters (date, folder, item type) to shrink the data volume you move at once and keep performance stable. For very large mailboxes, split PST files into manageable sizes and map folders carefully to preserve structure. Finally, test with pilot users, validate mail, calendar, and contacts, and only then schedule the organization-wide switch. With careful planning and the right toolset, zero‑downtime NSF to PST migration becomes a predictable, low‑risk project.

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