Attaching n Detaching Dbs !

A) In server Instance A execute the following script

use master
sp_helpdb 'test22'

test1 1 C:\backups\test_rest1.mdf PRIMARY 1408 KB Unlimited 10% data only
test1_log 2 C:\backups\test_rest2.ldf NULL 3456 KB Unlimited 10% log only

sp_detach_db 'test22'
Msg 3703, Level 16, State 2, Line 1
Cannot detach the database 'test22' because it is currently in use.

alter database test22 set single_user with rollback immediate
Nonqualified transactions are being rolled back. Estimated rollback completion: 100%.

sp_detach_db 'test22'

With this db is successfully detached.

B) Execute the following in server instance B

sp_attach_db 'test22','mdf_loc','ldf_loc'

Movement 2000 dbs into 2005 dbs successful
but
2005 dbs to 2000 dbs failure

Please note that while attaching and detaching dbs ,the dbowner will get changed.You will have to now use changedbowner to set the original owner of the db.For this before detaching please make a note of the original dbowner.