| Event Id | 4001 |
| Source | MSExchangeMig |
| Description | Error writing GroupWise message with subject '<data>' for user '<user name>' to IFF file. |
| Event Information | Migration Wizard could not write to migration files. Verify that disk space is available. Use the System Monitor and other utilities to measure memory usage and optimize performance. You may need to increase paging file size, or stop other running applications and remove unused files and applications from the server's disk. |
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