Not all users are populated in the UserstoMerge/UserstoMigrate.csv file after running the Directory Exporter.
The following lines may appear in the gwdirapp.wlog:
14:46:08 DEBUG: Try to export 'GAL' instead of accessing the System Address Book directly
14:46:08 DEBUG: Found address book 'GAL'.
From the GroupWise Migrator for Exchange computer, verify that the missing objects can be viewed in the Novel/GroupWise Address book, and are not hidden from view.
If objects are hidden, make them visible for the duration of the Directory Exporter run, then make them hidden again, once the Directory Exporter has been successfully run.
Try running the Directory Export while the Groupwise client is open.
Since GroupWise Migrator for Exchange uses the GroupWise client to extract the address book information, verify what the GroupWise address book on the GME console actually "sees" by performing the following steps:
1) Login to GroupWise client on migration console
2) Click on 'address book' button
3) Right-click on 'Novell GroupWise Address Book'
4) Select 'Properties'
5) Select the 'Contains' button
The result from clicking the 'Contains' button will give you the number of users, groups, resources and nested DL's that it can find.
Another option is to rebuild the Database Indexes which may expose the users for the export. For more information on rebuilding database indexes within GroupWise, please see the following Novell Document titled "26.4 Rebuilding Database Indexes" on how to achieve this.