ABG --
The fastest way to do this would be as follows:
1. Launch Microsoft Project Professional and log into Project Server
2. Click Tools - Enterprise Options - Open Enterprise Resource Pool
3. Select the "Include inactive resources" option and then click the Apply
Filter button
4. Manually select only the Inactive resources whom you wish to reactivate
5. Click the Open/Add button
6. Right-click the Type column header and select Insert Column from the
shortcut menu
7. Select the Inactive field and click OK
8. Set the Inactive field value to No for the first resource and press the
Enter key
9. In the Inactive column, select from the first value to the last value to
highlight the entire list
10. Click Edit - Fill - Down to fill the No value into the Inactive field
for every resource
11. Save and close the Enterprise Resource Pool
Hope this helps.