This section describes how to migrate to Denbun POP V3.1P R1.0.

The message storage space has been changed in Denbun POP V3.1P R1.0.
If you upgrade from V3.0 to V3.1, you have to migrate the mail data.

Before migration... This guide describes how to migrate from Denbun POP V3.0P R1.1 to Denbun POP V3.1P R1.0 If you use the lower than V3.0P R1.1, please upgrade it to V3.0P R1.1, and then follow the procedure of this guide. Make sure no access to the Denbun. If you use Automatic Receive, terminate the batch for Automatic Receive. With the task manager, you can choose the scheduler (dnpscheduler.exe) and automatic receive (dnpemlautorecv.exe) and use "End Process" to stop the process. Backup all the modules and database of Denbun. Please refer here about backup. Please make sure hard drive space. To migrate mail data, it requires 1.5 times as many as the data folder of PostgreSQL. Please make sure there is enough hard drive space. The size of the data folder becomes small because it deletes mail data from PostgreSQL's data folder. <Example of PostgreSQL's data folder> 　- Windows: C:\Program Files\PostgreSQL\8.3\data\base 　- Linux: /var/pgsql/data/base